Hundreds of good comments on here already, but I'll add another anyway, fwiw. I'm in a similar situation. 36 years old, haven't achieved much, no family, don't

Hundreds of good comments on here already, but I'll add another anyway, fwiw. I'm in a similar situation. 36 years old, haven't achieved much, no family, don't even have much savings. For me, though, what keeps me feeling excited about the future is problem-solving, especially in the machine learning field. There are tons of problems that still exist and need to be tackled, tons of products that I want to exist that don't. If I stay focused on "This solution does not exist yet and I want it to exist", worries about achievement and mortality get out of the way more easily. It's not about me, it's about the problem.