I'm 73 years old (74 in 3 weeks) and more of a distance rider than a speedster. No stretching before or after riding. I do a mile or so warm up and then a mile or so cool down period at end of the ride. I have aerobars on both of my road bikes and it's where I spend a good portion of my ride time.

After riding 30 miles with Amanda Coker - the day she broke the Guinness and HAMR World Distance Record - April 5, 2017.
My avatar is also with Amanda on the day she broke the woman's world distance record, just 4 months after she started the attempt - Sept 21, 2016.