With technologyical developments, people's life expectancy hads increased, and people in general they live longer than previous generations.

Medicine hads changed people's life expectancy, and at the present, serious deciseases and pandemics are not longer a threat to humanity.

Thatese circumstances have resulted in longer livfe expectancies, which brings opportunities to have more experiences and achieve more goals.

Vaccines such a Moderna and Pfizer were crucial to fight the COVID-19 pandemic.

Connecting this sentence to the next one

Awhich is a respiratory disease that for many people it is now just a bad memory.

Although the pandemic caused significant mortalityies, they were amount was lower than that of previous pandemics in history.

A second approach is thIn contrast, there are drawbacks ofrom this development.

More people are using cars and consuming plastics, which require to their production a lot of scarce natural resources that are limit in the planeto produce.

Scarce = limited

Countries do not have the amount of money needed to pay pensions to an increasingly growing population.

However, a longer life expectancy brings some negative implications like using more resources than are available, and it brings some problems to finance old people's pensmakes it more challenged to finance the pension for the elderly population.

With technologyical developments, people's life expectancy hads increased, and people live in general live longer than previous generations.

While there are some positives outcomes as a result of this phenomenon, there are also drawbacks to consider.

Medicine hads changed people's life expectancy, and, at the present, serious deciseases and pandemics are not longer a threat to humanity.

Thatese circumstances have resulted in longer lives, which bringsallow for more opportunities to have more experience things and achieve more goals.

Vaccines such as Moderna and Pfizer were crucial toin fighting the COVID-19 pandemic.:

You define COVID-19 in the next sentence, so these sentences should be connected with the same subject in the middle. Such as:
"Vaccines such as Moderna and Pfizers were crucial in fighting against COVID-19, a respiratory disease that is now just a bad memory for many people."

A respiratory disease that, for many people it, is now just a bad memory.

Although the pandemic caused significant mortality, they were death rate was lower than that of previous pandemics in history.

Not sure what "they" is referring to. Mortality just, in this case, means "mass death," so I don't think you can apply modifiers like "more" or "less" to that word.

The consequence¶
As a result of these advances are that, people are able to spend more time with their relatives and have more experiences.

"Consequences" has a negative connotation. "Result," is neutral.

A second approach isWe should also consider the drawbacks tof this development.

Or, if you don't want to use "we":
On the other the hand, there are drawbacks to this development.

Now that people live longer, they also consume more resources than are available.

More people are using cars and consuming plastics, which require tofor their production a lot of natural resources that are limit ied on the planet.

We call these "limited natural resources." This is a very common term, so I think you can use it here.

Another negative implicationconsequence of this phenomenon is the lack of finance ofunds in the pension system.

"Implication" can't be used like this. We usually use "implication" to talk about the hidden meaning behind someone's words. If I say "chocolate is the best flavor," the implication is that I don't like vanilla. <- a very simple example, but hopefully that makes sense.

Countries do not have the amount of money needed to pay pensions to an increasing growing population.

In conclusion, with advances in medicine people are able to live longer, and that hads made it possible for them to spend more time with relatives and live more experiencenjoy their lives for more years.

"live experiences" -> enjoy life. In English, we don't really talk about "having/living experiences" very much, but "enjoying life" is a phrase you'll hear often.

However, a longer life expectancy brings some negative implications like using more resources than are available, and it brings some problems to finance old people's pensionraises the issue of financing pensions for the elderly.

Brings problems -> raises the issue /raises issues <- very common phrase!

With technologyical developments, people's life expectancy had increased, and people in general live longer than previous generations.

While there are some positives outcomes of this phenomenon, there are also drawbacks to consider.

Thatose circumstances have resulted in longer lives, which brings opportunities to have more experiences and achieve more goals.

Vaccines such as Moderna and Pfizer were crucial toin fighting the COVID-19 pandemic.

A respiratory disease that was fatal for many people it is now just a bad memory.

Although the pandemic caused a significant increase in mortality, they wereit was lower than that of previous pandemics in history.

A second approach isOn the other hand are the drawbacks of this development.

More people are using cars and consuming plastics, which require toand their production of cars and plastics requires a lot of natural resources that are limit ied on theis planet.

Another negative implication of this phenomenon is the lack of finance ofor the pension system.

In conclusion, with advances in medicine people are able to live longer, and that hads made it possible to spend more time with relatives and live more and have more lived experiences for more years.

However, a longer life expectancy brings some negative implications like using more resources than are available, and it brings some problems to finance old people'the elderly’s pension.

With technology developments, people's life expectancy hads increased, and people in general live longer than previous generations.

Instead of "With technology developments..." I would say "With improving technology..."

Medicine had changs improved people's life expectancy, and at the prescurrently, serious deciseases and pandemics are not longer a threat to humanity.

Decease and disease are different words. :)
"At the present" is very formal/unnatural sounding. I would use currently instead.

Thatese circumstances have resulted in longer lives, which brings opportunities to have morelets people both experiences and achieve more goals.

Outside of result/resulted, your sentence is correct. I've just suggested a more natural/shorter version of it.

Vaccines such as Moderna and Pfizer were crucial to fight the COVID-19 pandemic.

A respiratory disease that for many people it is now just a bad memory.

Although the pandemic caused significant moralitydeaths, they were lofewer than that of previous pandemics in history.

Mortality and morality are different words. :)

The consequences of these advances are that people are able to spend more time with their relatives and have more experiences.

Option 1:
The consequences of these advances are that people are able to spend more time with their relatives and have more experiences.

Option 2:
The consequence of this advance is that people are able to spend more time with their relatives and have more experiences.

Note the matching of consequence(s) to this advance/these advances

A second approach is thHowever, there are drawbacks of this development.

More people are using cars and consuming plastics, which require to t. Their production a lot ofrequires natural resources that are limit in the planeted.

Another negative implication of this phenomenon is the lack of finance of thefinancing of pension systems.

In conclusion, with advances in medicine people are able to live longer, and thait hads made it possible to spend more time with relatives and live more experiences for more years.

However, a longer life expectancy brings some negative implications like using more resources than are available, and it brings some problems to finance old people's pensions.

With technology developments, people's life expectancy hads increased, and people in general live longer than previous generations.

While there are some positives outcomes of this phenomenon, there are also drawbacks to consider.

Medicine had changed people's life expectancy, and at the present, serious deciseases (??) and pandemics are not longer a threat to humanity.

This point is controversial. You should explain it since it goes against common arguments

That cCircumstances have resulted in longer lives, which bringcreates opportunities to have more experiences and achieve more goals.

Vaccines such as Moderna and Pfizer were crucial to fight the COVID-19 pandemic.

ACOVID os a respiratory disease that for many people it is now just a bad memory.

This sentence makes no sense. I also completely disagree with this point and think you need to provide supporting details.

Although the pandemic caused significant mortality, they wereit was lower than that of previous pandemics in history.

The consequences of these advances are that people areinclude being able to spend more time with their relatives and have more experiences.

A second approachnother point to expand upon is the drawbacks of this development. (What development???)

This sentence doesn’t make sense.

Now thatAs people live longer, they also consume more resources than are available.

More people are using cars and consuming plastics, which require to their production a lot of natural resources that are limit in the planeted.

Another negative implication of this phenomenon (what phenomen???) is the lack of finance of the pension system.

This sentence makes no sense.

Countries do not have the amount of money needed to pay pensions tofor an increasing growing population.

In conclusion, with advances in medicine people, people are able to live longer, and that had made it possible to spend more time with relatives and live more experiences for more yearsto enjoy fruitful experiences as they age.

You can’t write “in conclusion” if it isn’t at the end

However, a longer life expectancy brings some negative implications like using more resources than are available, and it brings some problems to finance old people's pension.