Go slow and have patience. Get into it, it really is habit forming. It's never to late to start stretching. In fact, the older we get, the more important it becomes to stretch on a regular basis. With age and inactivity, the body gradually loses its range of motion.
Muscles can lose their elasticity and become weak and tight.
The body has an amazing capacity for the recovery of lost flexibility and strength if a regular program of stretching is followed. The basic method of stretching is the same regardless of differences in age and flexibility. Stretching properly means that you do not go beyond your own comfortable limits. Learn to stretch your body without force, stretch as if you were bending something precious that you did not want to break, but, had to be bent back into shape.