In our country the concept of staying fit after a certain age is not in vogue. This means that most senior officers pay little attention to physical fitness (a shame) and only engage in limited sports (squash, tennis, golf etc.). The physical standards are also relaxed in the 40s and 50s.
Staying fit requires personal commitment. Most of our people don't bother. That aside, there are exceptions. As an example, in the SSG, even the GoC is expected to be fit and able to go on exercises with the troops in the field. However, most other formations don't adhere to this. The current CoAS is in a good trim and in the past too, some senior officers (not all) have maintained good standards of physical fitness.