It is interesting to note that the Yoga Master we studied with in India in 2003, K. Pattabhi Jois, was 88 years old at the time and is still active now.
His student B.N.S Iyengar, whom we also studied with, was 78 and he is still actively teaching today.
Another more famous Yoga Teacher B.K.S Iyengar has just passed 90 active and going strong.
Their teacher T. Krishnamcharya, and arguably the biggest single influence in Yoga, lived to over 100 years old.
While not a comprehensive study of longevity by any means, living a balanced life and sharing that with others in a supported social environment is a wonderful way to invest our time.
Here is an wonderful article about a Yoga teacher who is a living example of Yoga at 90