Yoga For Weight Loss

My body is about as flexible as the religious right's views on gay marriage, but, thanks to a helpful "nudge" from friends at the fitness club, I'm working on it. And it feels good. I don't want to be THAT hunched over old guy. I should ready this fall, after the Chicago Marathon, to try a beginner's yoga class. Here's an article on how yoga may help people keep weight off at mid-life. One question, though: When did ages 53-57 become mid-life? Might I really live to 106-114? Hope not.