Walking
I play 2-3 times per week with a group of retired guys.
The oldest is 79 the youngest around 65. We start at 7 a.m. They call us the Dewsweepers.
We all walk, and can usually play 18 holes in 3 1/4 to 3 3/4 hours
A couple of us have electric carts but the rest have push carts, one even carries his clubs.