I was a serious cyclist from the early 80's thru mid 90's raced both on the road and mountain bikes and did double centuries, triathalons etc. life happened and pretty much stopped riding and focused on running. last year I decided to start riding again. In July of last year I bought a heavy steel 1x11 bike with a mustache bars and figured I would just putter around and enjoy the fresh air. I did not realize I would get hooked again. In the last year I have put on about 8000 miles. I am almost 65 yoa and I don't really know what defines slow, is 15,18, 20mph considered slow?. I try to average 18mph or above and actually am disappointed if on a long ride don't average close to that. I did a century earlier in the month and averaged 18mph and actually felt a little disappointed. I have a new, more road oriented lighter bike ordered and my goal is a 5 hour century. I know I probably will be disappointed and find out that father time has caught up to me..