Adding some more points
What is main issue or characteristics of aging
You muscle mass will start to decrese from your 30s or 40s. This will continue till 60s then some drastic decrese will happen. As your muscles get weaker you won't be able to do basic human needs like standing up from a chair.
Why resistance training?
This will make sure that your muscle mass don't go too less and thus lesser effects of aging.
Other points
50% of the Indians are expected to be obease. Maintaining good muscle mass will ensure higher metabolism and thus less chance of obesity and heart diseases