70 is too young to give it up. My great grandfather was still having kids at that age with his second wife. She was 35 years his junior. They kids did age him though. He died at 109. I was told he still went duck hunting up into his 80's.

It is all about how well you get around and how you feel about hunting. I took my father dove hunting for the last time at 90. Now six years later he has no interest in hunting at all. Still fairly mobile I would gladly take him again if he changes his mind. Age is a number it is all about how you feel and what level of activity you can handle.