Zen, I ride with a group of very experienced riders who are mostly "older," like me. But, most of them live nearer to the city (flat) and are not used to climbing like I am. I always end up behind the leader, or at least in the front with the guys on the hilly rides. At least that makes me feel good, even though this group is a "smell the roses" group who never averages more than 15. But, quite a few of the guys in the group are really strong riders, who do incredible distances.
But, when some of those weak climbers pass me on the descents, I get pissed.