Was chatting with a couple guys yesterday about how we still participate in sports at an age when our fathers were more sedentary, when one of them said, "Growing old is mandatory. Growing up is optional."
It's a great line; when I Googled it later, it was attributed to both Chili Davis and Bob Monkhouse. I also stumbled across a Wikiquotes site which featured observations on aging. A few of the more clever ones:
"On being old -- it's not nice but take comfort that you won't stay that way for ever." -- J.P. Donleavy
"We don't stop playing because we grow old; we grow old because we stop playing." -- Joseph Lee
"Inside every older person is a younger person wondering what happened." -- Jennifer Yane
"Wisdom doesn't necessarily come with age. Sometimes age just shows up all by itself." -- Tom Wilson
"It's never too late to be what you might have been." -- George Eliot
"First you forget names; then you forget faces; then you forget to zip up your fly; and then you forget to unzip your fly." -- Branch Rickey