I am 43 and i would like to know how to gain muscle mass at my age?

Resistance training: Is the most efficient exercise to gain muscle mass, at any age.Get an experienced trainer who can MAP out a good regemin.Proper technique will enhance results and reduce chance of injury. Good luck.

WORKOUT/EATING RIGHT: First thing you have to eat right, you need more protein like lean chicken, beef, eggs;fish.Supplement with vitamins and protein shakes join a gym and do resistant and weight lifting exercises if possible under a trainor but go slow and also cardio exercises get advice from a bodybuilder or from web tapes how to do it if you need help.