Die With Money?OPTION A: Will I Maintain Financial Security in My Old Age ¶
OPTION B: Achieving Financial Security in Old Age -- Some Thoughts

OPTION A is more personal and OPTION B is less personal.

ALSO POSSIBLE: In the summer of 2024, I started to receive mying a pension and had a little more financial freedom, so I decided to do something I hadn’t been able to beforepreviously incompleted - organize my jewelry box.

Most of the items I bought myself when I was younger, as well as my mother's keepsakes,. They no longer fit me, so I started by resizing themy rings.

ThenMoreover, I took anysome old items I couldto turn into cash to buyers.

Fortunately, gold prices were at their highesthave been very high lately, so I sold some gold items to raise funds for new purchases.

WThen I bought a platinum chain at Nihonbashi Mitsukoshi, itMitsukoshi's Nihonbashi store. This was my first experience of beacting pseudo-rich.

It's really amazing how old jewelry that couldn't be usedseems useless can be revived.

I spent a fair amount of money, but I gained a fair amount of knowledge and some valuable gemstones, so I can say that it was the first and last great entertainment of my life.

I want to be grateful for my current happy circumstances, but I only have at most a dozen years left in my life, so I want to use my jewerly generously.

In the summer of 2024, I started to receive my pension and had a little more financial freedom, s. So I decided to do something I hadn’t been able to before -, organize my jewelry box.

The original sentence is fine but I would break this into two separate sentences.

Most of the items Ithat I had bought for myself when I was younger, as well as my mother's keepsakes, no longer fit me, so I started by resizing the rings.

If you did the resizing yourself, then this is perfect. If you had a jeweler do it then the last part would be better as "... fit me, so I started by having the rings resized."

Then I took any old items I could turn into cash to buyers.a trading company.

For me, this still sounds a little unnatural for selling jewelry. I might say, "Then I took any old items I didn't want to place that buys gold and jewelry and sold them for cash."

Fortunately, gold prices were at their highest, so I sold some to raise funds for new purchases.

This is 100% correct and good. Alternately could also say "Fortunately the price of gold was high, so I sold some pieces so I could buy new jewelry."

Just when I thought I might be reaching my limit, almost a year hasd already passed.

more natural

I spent a fair amount of money, but I gained a fair amount of knowledge and valuable gemstones, so. I can say that it was the first and last great entertainment of my life.

This is correct. It doesn't have to be the "last" though. Stay engaged and entertained everyday. There are always a lot of new things to try and do.

I want to be grateful for my current happy circumstances, but I only have at most a dozen years left in my life, so I want to use my jewerly generouslry freely.

Generously is ok but freely might be more natural.

It is said that elderly people in Japan will be the wealthiest when they die.

I want to be grateful for my current happy circumstances, but I only have at most a dozen years left in my life, so I want to use my jewerlry generously.

We cannot bring money with us when we diepass away, so we should spend as much of it as we can before we diethat.

Your original sentence is by no means wrong, but I notice that "die" is being repeated a lot (including in the previous sentence), which makes this sentence sound rather stiff. To avoid using it too many times in close proximity, I have replaced some instances of it with something else.

Just when I thought I might be reaching my limit, almost a year hasd passed.

Your sentence would be very normal/natural in spoken language, but the past perfect (had passed) would be correct in written English.

I want to be grateful for my current happy circumstances, but I only have at most a dozen years left in my life, so I want to use my jewerlry generously.

I only corrected a small typo :-)

A small suggestion: "I want to be grateful for my current fortunate circumstances" might flow a little better/stay in the same register better than "my current happy circumstances." Once again, your English is impeccable, so this is just a stylistic suggestion.