Occasional fashion disasters notwithstanding, we take pride in our originality. Nonetheless, we find that an old adage still rings true once in a while, and “you’re only as old as you think you are” is a phrase we find ourselves throwing around on a daily basis. Our bodies and minds are on a feedback loop—if you give in to feeling old then your body is quickly going to follow suit. But if you adopt the “50 is the new 40” (even better, 30!) way of thinking, then you’re likely to find your physique complying.