Crimson, you will have to tell me what you have by way of available activities for older people.
I am a committed couch potato [ten-hour shifts was enough exercise for me] but until recently I walked pretty much everywhere after I retired. Then, I was skittled by a mad loon cyclist riding at speed on the pavement, [ a middle aged man, wearing leathers, & a helmet, no bell, no warning shout, until he yelled that I should look where I was going.] That left me with ripped knee muscles and an award winning limp. Now the only thing I ride is my broomstick.
Other than being aware of the current craze for lycra wrapped cycling, and running, I don't know anyone our ages who does much sporting stuff. Australians are sports mad, but most seem to do watching, rather than playing - especially watching football, or which we have many codes.
Living within walking distance to a beach might mean swimming and surfing, but parking is usually impossible if you need to drive there, so…
Bush walking is popular, but I would rather stick pins in my eyes than stumble over rocks and down steep slopes. Once was enough.
Probably TMI, sorry.