It actually gets better as you get older. You get better. Life gets better. The merry-go-round slows down and you can finally enjoy the ride. I'm not going to tell you it's easy; especially in this economy or that it happens automatically like your invitation to join AARP. But it is possible as long as you're willing to do the work.
It's a self-fulfilling prophecy as the more you focus on what you don't have, the more you feel like you don't measure up. Listen, we are all human and it's natural to notice what someone else has, but if you can catch yourself once you make that observation then you will be able to keep it all in perspective.