When you're young, you think that the first attractive girl that smiles at you is the most amazing creature on earth. So if things don't work out, you're devastated. If other things are not going so well for you at the time, it can be pretty rough. But as you get older and gain experience, you realize that there will always be other women and if that girl liked you, other similar ones will as well. So I think experience gives you perspective.
As for older men committing suicide, I think it's not so much that they miss the woman, but the way they get screwed over in divorce and stripped of their assets and connection with their children.