I want to encourage anyone out there who is getting oldish.
Ever since I got into it, I have felt healthier and stronger. My back feels great and I don't wake up with a stiff body.
Granted, you don't burn many calories like you do with Cardio. But as far as flexibility and strength go, it can't be beat.
If you are worried about the clear your mind meditation stuff - - most of the yoga I have seen in the past few years is simply fitness yoga.
I personally think the practice of yoga is very spiritual. I intentionally find moments in my poses to pray. Everytime I lift my arms to the sky or bring my hands to my heart, I whisper a little word of praise, "My all for you Jesus."