Time passes. We get old every month, every day, every hour, every moment. We grow old slowly but surely, and each birthday, we add a year to our age. However, there are some people who cannot stand the thought of ageing, and I think it's mostly because they don't want to imagine themselves like -- pardon the expression -- a wrinkled prune.
1. Old is not the same as wise.
"A fool thinks himself to be wise, but a wise man knows himself to be a fool."
― William Shakespeare, As You Like It
2. Old is not the same as right.
“Right is right even if no one is doing it; wrong is wrong even if everyone is doing it.”
― Augustine of Hippo
3. Old age does not guarantee respect.
"You're right. I'm older. You've lived longer than me, but I'm older than you. And better 'n' you. And madam, that ain't hard."
― Terry Pratchett, Lords and Ladies
It is easy to show the elderly courtesy, but respect needs to be earned, no matter what age a person may be. It cannot be demanded of other people, neither can it be bought with money or promises.
Come to think of it, being young does not mean being wise, being right, or being respectable either. Both youth and elderly can be, though.
In all, I think it's a matter how we value our time. If we experience but not learn, if we grow old but not grow up, and if we only want the world to revolve around us, then we probably didn't make good use of what happened in the past 365.25 days.