As you get on in years, you feel the need to pass on your accumulated wisdom to the younger generation, which they will promptly ignore until they're as old as you are, at which point they'll admit that you were right all along and their lives would have been *so* much better if only they'd listened rather than listening to that crappy music of theirs (why oh why can't they have any taste in music?)
So, at the risk of repeating the Miss Manners incident, I hereby present the following list, in no particular order:
Eric's Tips for a Happy Marriage
Why should you listen to me? 7300 days, baby!