I've been out 3 times on my new week old hybrid, having not ridden a bike for 40 years. But after an half hour or so, my butt is painfully numb, if the two aren't mutually exclusive. I'm thinking of swapping seats for something a little wider but a co-worker said don't bother - I'll toughen up if I give it a week or two - and that I'll be surprised. Easy for him to say, he's not 56. My cycling club has a 35k leisurely passed ride on Sunday. I know my cardiovascular system is up to snuff - but I'm not sure my bottom is. Any advice?