Why do some men divorce their aging wives and go on to marry younger ones?

Aren't men supposed to love their wives for her character and not just for her looks?

If wives can overlook their husbands' sagging butts, pot bellies, man boobs, bald heads, greying hair, hairy ears/noses and flagging libidos and still love and respect them, why can't their husbands overlook their wives' bodies, forever changed by childbirth, weight gain, celluite, greying hair, wrinkles and waning interest in the bedmatics of her youth?

If some husbands are divorcing their old wives and running off to marry younger women, and other men their ages are running after younger women, just what are these First Wives supposed to do for companionship or look to, if they want to remarry?

Should they...

...resign themselves to being lonely for the rest of their lives and just concentrate on their grandkids, if they have any?

...throw themselves into church, civic and charitable activities, in hopes that keeping busy will alleviate their longing for human companionship?

...toss their hats back into the Dating Pool and hope some suitable man will bite?

...become some younger man's 'Sugar Mommy' and risk being thought of as a desperate, foolish old woman?

Or...wither away on the vine, hoping against hope that the husbands they loved and respected for so many years will come to their senses and come back home where he belongs?