Yes, strength training later in life has many benefits. ... The advice: resistance training exercises should be performed 2 to 3 times a week to work major muscle groups including arms, legs and the core. The goal: lift a weight that's heavy enough to achieve 10 to 15 repetitions per session before muscles become fatigued.
http://www.jrhealthblog.com/how-to-start-training-with-weights/