Yes it was Shri AB Purani ji who noted the marked change in Sri Aurobindo. In those who sincerely take to the Yoga some changes even in the physical do begin, for example a delay in the ageing process, less fatigue, slowing of the deterioration of certain organs, relative mastery over diseases etc. Yes even the face does show some change due to plasticity instead of rigidity.
Affectionately,
Alok Da