Fascinating. The ability to endure disease, fatigue and other hardships is influenced by voiding?
Let's make it simple. Just tell him to eat a good, varied diet with minimal saturated fats and keep his alcohol consumption down. A daily vitamin and mineral supplement would not go amiss too.
Exercise of any type should not be undertaken in anyone of that age without consulting a GP first especially since we know nothing of the gentleman's medical history.
Some types of meditation need a fair degree of joint and muscle flexibility. Can we be certain that the gentleman concerned has such flexibility?