This is so cool to hear, about your grandpa. The greatest golfing pleasure I have these days is teaching my three grandsons to play. Started about three years ago; they are now 16, 14, and 11. I gave each of them their own set of clubs in 2007 so they would learn to take care of them. We get out once every month or so, as their busy teenage schedule permits. A lot of life-lessons can be learned on a golf course; plus it is fun!
My own schedule is not crowded, as I just turned 72. I was quite surprised to see that the 'over 60' category on this site is less than 2%.