My OElderly Father

"Old" is often used as a term of endearment, instead of speaking about age. Here, I would use "elderly" since it is always about age, and it is also respectful whereas "old" can be taken negatively

My father is near completly seventy years old.

"Complete" would add nothing here

He has reached a nice old age because pratiche exercises regularly and eats very nicewell.

We often use "reach" instead of "have" when speaking about the age of a person

He has not stopped to be a good exeample for me.

My father is near complealmost seventy years old.

He has a nicelives a good old age because praticehe always exercises and eat very nices well.

He notever stops being a good exeample for me.