As a man, why is it important to strength train as I age?

Your hair may thin and your jawline may seem determined to move south, but there's one thing you never have to give up as you grow older: young muscles.

Strength training affects muscle DNA on a cellular level, giving it the profile of much younger muscle tissue. The result? Pump some iron and you'll considerably narrow any natural strength gaps that exist between you and those still-wet-behind-the-ears younger men.

Muscles get weaker as you get older for lots of reasons -- and most of those reasons boil down to the natural aging process. But strength training halts much of that -- right down to changing the rate at which muscle deteriorates.

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