My impression is the decline of old age is somewhat inevitable without interventions like HRT. Especially for women who after menopause will inevitably develop

My impression is the decline of old age is somewhat inevitable without interventions like HRT. Especially for women who after menopause will inevitably develop some form of osteoporosis AIUI. But before reaching that point you can obviously improve bone density/strength/balance/athleticism in general to raise how high your peak is where you'll start declining from. In lieu of bad injuries I don't think there are any down sides to pushing these variables upwards while you still can.