I have never actually considered "Yoga". This might be possibly because it comes over more as a female thing than male. Another reason may also be is that when I think of "Yoga " I think of very fit supple people making moves that even Houdini would have difficulty performing, such as putting your legs behind your head.
I have to say "Joyfully" you put in a very good advertisement for trying this activity.
In the last year I have tried "Tia Chi" but bailed after the first lesson as I couldn't understand the teacher. In the lesson though there was an aspect that I found encouraging and that was that there were quite a few people in the senior age group participating. I see this as positive and the way to go.
Unfortunately I have not perused the "Tia Chi" any further but have maintained the occasional punishing workout on a cross trainer in an attempt to keep the weight down.