When I was a small child, I made Cs & Ds in PE. Couldn't touch my toes then, either. Fast-forward half a century, add desk-job-itis, and flexibility is something to be envied in the young.
If you identify with even part of the above statement, check out Hot Yoga. Seriously. The heat helps the joints move easier, and you lose weight faster. Every time I see an old person wobbling around with a walker, I commit myself even more to Hot Yoga: http://bikramyoga.com/