I am almost 49 years old and pretty flexible for my age and I never stretch...The only time of my life when I stretched a lot was when I was 14-17 years old because I was doing some martial arts at that time and stretching was a big part of it, but then I stopped and never stretched since then...I find that doing strength training and conditioning workouts, riding my bike, walking and being physically active is enough to maintain my flexibility....I've never been to a chiropractor or a massage therapist, in fact I haven't even had a medical check up for the past 22 years.