Hope no one minds if I bump this 3-4 month old thread, but I thought it was interesting.
At one time I might have hotly debated with my kids regarding the issue of marriage, but now I realize that this is really a rather minor bump, if its a bump at all, in THEIR LIVES, not mine.
IMHO, humans are naturally programmed to become parents at 16-20 years old, and die at about age 40.
We have artificially extended our lifetimes, yet we have antiquated social norms: i.e. we expect marriages to begin Later and Last Longer than nature ever has intended for our species.