Champaklal is always shown as fit person, who does his exercises regularly and eats the right food and Jethalal is exactly opposite to that. So the makers always insist on that track to show funny scenes.
Although yes some people at 60 can be quite fit. i have personally seen some senior people playing tennis and doing many other activities. So it is Ok for me. although watching him dancing is too much.As for him always after Jethalal, sometimes cvs go overboard but they do show that basically champak also loves him lot and Jethalal totally respects Babuji. I guess his mother died young and they have a close relationshipI also think Babuji is not above 60, he might be 55.
At the staring of show , they showed him at 65 & now after 6 years he must be at 70.
Also From day 1 , he is on stick & before 6 years at age of 50 how can he walk with stick >??