If you’re 40 or approaching 40 years old, don’t put off building the body you’ve always wanted because you believe you’re “too old”.
A 2009 study  at the University of Central Florida demonstrated that any difference between the results a 40 year old and an 18 year old gets is actually very small.
A 12-week study was set up with 826 men and women – the largest study ever conducted on strength training and age.
The subjects trained their arms (biceps and triceps) twice a week for the 3 month duration of the study.
Although the 18-19 yr olds did increase their 1 rep max by a little more, there actually wasn’t any difference in how much actual muscle size the groups added.
The researchers concluded:
“The size of this effect is very small in comparison with the enduring ability of skeletal muscle to adapt to resistance. The muscle size and strength response to resistance training is not influenced by age in any practical manner through the fourth decade of life.”
Yes indeed. Skeletal muscle DOES continue to adapt if there is a big enough demand placed on it to do so.
And the best way to place this demand at any age is with THT training.
Train With Intensity – Always!
 Association of age with muscle size and strength before and after short-term resistance training in young adults. J Strength Cond Res. 2009 Oct;23(7):1915-20.