Being senior: yes, but at your best!
Staying in good health means preventing some pathologies so as to stay young longer. Doing sports that are adapted to your needs will help you stay fit because there is a causal link between the passing of time and staying healthy. It is a fact of life: the older we get, the more health problems we develop.
The key to staying fit is a moderate workout centered on postural exercises. Support muscles are stretched, then strengthened for achieving better balance. An appropriate cardiovascular workout will add to your enjoyment.