I'm probably one of the older if not the oldest to take up the challenge. I've been practicing ashtanga yoga for a number of years and was getting started in the second series last year. But then I got frozen shoulder and couldn't practice for first three months of this year. Started again with modified half primary series in April & doing almost the full primary now, but the range of movement in left shoulder is still limited. My back has also got very very stiff and the back bend has gone back to a table pose.