I ride a Trek 1000C (upgraded to 105). It is comfy.
Lot's of vitamins and Tylenol.
I don't think I've slowed down to much but in reality I guess I'm quite a bit slower than 25 years ago.
I biked alot years ago but kind of got away from it through the 80's and 90's but now I'm back.
I prefer to ride alone or with a friend. I do medium rides. I also do rec rides with my 4 year old son.
I ride at least 10-15 miles a day during the week and I try to ride 20-25 miles a day on the weekend. I guess I ride about 4600-4700 miles a year including time on a trainer in the winter.
Unfortunatly biking is my only regular exercise except for work.