Why does it hurt now?
 

I ride on a pretty regular basis and don't normally get hand and butt pain (at least not a lot). But I did a 60-mile ride the other week and my hands and butt really bothered me. I chalked that experience up to the distance. Then I rode a 35-mile ride and again had a lot of pain. OK, I thought, this bike is really not comfortable. I'll ride my flat bar road bike that I use for commuting and that hasn't caused any problems. Today I did a short ride (battling a cold) on my flat bar bike and again had uncomfortable butt and hand pain. What is going on? (I'm 62 and wonder if the longer ride "bruised" me so that I'm more sensitive than before. Is that possible?)

While bruised may be too strong, it's pretty normal for an injured or irritated area to be more sensitive for a while. Give it more time to recover, or try to stick to shorter rides for a short while and you should be fine.

There's no need to look further for the moment, because you have the proven "before" history confirming that things were otherwise OK.

BTW - while the butt pain is usually pretty straight forward -- excess pressure or pounding where you sit -- hand pain can be more complex involving nerves and tendons. While waiting to get back to form, you might make a point of moving your hands more as you ride to avoid the "hot spot" as much as possible.