After careful consideration, I came to the conclusion that there isn’t really a right or wrong answer to this question. Furthermore, far greater minds than mine have spent hours coming up with a perfect number. Most people want to live until a 100 or live for ever. I have no such desire. Both those options are setting a limit on your life.
In my humble view, treating age as a number is missing the point entirely.
There will come a day when we all we die. So, there is no perfect time to die, and similarly there is no right age to live until.
I live for today, plan for tomorrow… there isn’t much else I can do…
Finally, remember, you die, you did what you did. The world will carry on… so focus on living a happy, fulfilling life where I am happy and people around me are happy.