One of the most striking effects of age is the involuntary loss of muscle mass, strength, and function, termed sarcopenia [1–3]. Muscle mass decreases approximately 3–8% per decade after the age of 30 and this rate of decline is even higher after the age of 60 [4,5].
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Typically, muscle mass and strength increase steadily from birth and reach their peak at around 30 to 35 years of age. After that, muscle power and performance decline slowly and linearly at first, and then faster after age 65 for women and 70 for men.Of course you can still build muscle after the age of 40. Its only an arbitrary number that should have no sudden impact on your determination to be healthy and feel great. The only factor you should take into consideration is the natural ageing process which our bodies all go through.
Can a 65 year old build muscle
Repeated research has shown that, through weight training, men and women in their 60s and beyond can grow muscles as big and strong as an average 40-year-old.