That's so odd. I can't ever remember being bored except when as a child I was dragged on trips or to old people's houses (no kids, no or biting dogs), and as an adult when forced to be somewhere I didn't want to be. I could always entertain myself.
When you get old you never get bored because time goes too fast. I counted yesterday sixteen games or expansions I've not yet played, and probably that many again I've not yet finished. (I was playing Counterstrike Source when I counted, most of the reason I'm so far behind.) I've got aquariums to set up (and fish and inverts to collect or buy to put in them), the basement to tile, still have to replace the steering and mount the outboard on the boat, books I've not yet read, game fish I've not yet intimidated...
Assuming there you have no new games to play or old games to replay, you could:
1) Go fishing.
2) Go to the water and look at the interesting things under rocks and debris.
3) Read a book.
4) Write a book or short story.
5) Find a large dictionary and look up things that have made you wonder.
6) Write your Congressman or MP (there must be SOMETHING that pisses you off.)
7) Call or visit a friend you've not been around lately.
8) Hit on a girl or boy you've not yet hit on (but always wanted to.)
9) Volunteer, either at a homeless shelter (will make you very glad to be sane and at home) or doing something that interests you.
10) Ask a friend or relative if they need help with something.
11) Talk to a very old person about the war or the great depression, or just life when they were young.
12) Imagine one thing the world needs, or that you'd like to have, that doesn't exist, or one thing that would make part of your life easier if it existed.
13) Study a foreign language (or a programming language.)
When you get old you'll realize there isn't enough time remaining to do everything you'd like to do, so you might as well start now, thinking of things you'd like to do and then going and doing them. Life is too short to be bored.