Many middle-aged people want to know if it’s too late to get fit.
Most of them have tried many diet and exercise programs already, and the results look grim. Everything they eat seems to stick to their stomach, hips, and thighs. Their body doesn’t respond to exercise the way it once did. Their metabolism feels sluggish, their hormones screwy. 
And so they’re reluctant to follow my advice. They don’t want to fail again, or worse, get hurt, and feel weak, confused, and vulnerable. They don’t want to waste their time chasing a mirage. 
If I’ve just put my finger on your pulse, you’re not entirely mistaken. 
The human body does change in undesirable ways as it gets older—ways that do indeed conspire against your health and fitness. 
That doesn’t mean you’ve missed the fitness ferry, however. It only means you just can’t get fit the way you used to. 
When you were younger, you may have eaten what you wanted, lived how you wanted, and enjoyed the body you wanted. This formula probably consisted of eating out regularly, going for occasional runs or bike rides, and flaunting lean, defined muscles—a recipe that no longer works and never will again. 
More and more scientific research is showing, however, that while “aging” isn’t optional, genetics affect lifespan and longevity far less than most people believe. 
Simply put: what appears to most influence how we age isn’t time, but lifestyle. 
We get heavier and weaker because we stop exercising and overeat too often; our joints fall into disrepair because we weigh too much and move too little; and we develop disease and dysfunction because we allow our bodies to stagnate and sour. 
So, while we can’t change our chronological age, studies show that we can reverse our biological age and restore much of the vigor of our younger years. 
In fact, more or less every negative aspect of aging can be mitigated by proper exercise (especially strength training), diet, sleep, and supplementation. - Mike Matthews