I have a feeling that old people benefit more from yoga than young people do. Partly because older bodies rate to have more and deeper ways to improve. And partly because older people rate to be more spiritually ignitable.
If my conjecture is true, you could use it as a great excuse to not start your yoga practice yet. The longer you put it off, the more you’ll benefit from it when you do it! So you might as well wait until you’re like, I dunno, 95 years old or so. That way you’ll be getting the maximum value from each yoga minute.