Wow, there are a lot of suiciders in here. You might feel differently when (and if) you actually reach the age that you propose for self-annihilation. There's so much to do and learn in this one precious life that we have, it's hard to imagine ever being bored.
I think I'm most looking forward to the "fuck it" years where you can do and say anything you want and people will just go, "Oh, that's just grandpa. He's old, you know." The only thing that will spoil it is if I get a disease that affects my ability to think and learn. Senility does run in my family, so hopefully there will be some kind of treatment for that by the time I reach that age.