I sometimes wish I could fall asleep and just not wake up
Why is this something that you wish for?
Because it sounds like an interesting alternative I think about often
You should never wish for yourself to die. It's important to find things that make you happy in life.
I guess I am old now and I have nothing to live for.
You always have something to live for! If you feel like that than it may simply be time to pursue a new goal. If you feel like you are stressed and not able to pursue another goal than you may simply need someone to talk to so you can let some of those thoughts out.