Reminds me of the elderly person who wanted to learn to play the piano, and asked how long it would take.

"Five years," said the teacher.

"Five years! Do you know how old I'll be in five years?" asked the prospective student.

"The same age you'll be in five years if you don't study piano," answered the teacher. "But you'll know how to play the piano."

We can't stop aging (although science is trying), but we can do the most we can with the time we have. The time to give up and die is when you're already dead...not before.