That could be true, but older fathers also have more defective genes, are less able to play with their children, etc. The children are just genetically "weaker", have more physical issues and participate in far less physical activity because their father is so old.

This is anecdotal evidence but one of my friends had a very old dad. He had issues which forced him to wear bifocals and hence he didn't participate in sports. And his father was 60 when he was conceived so his dad didn't play catch with him or get him to try out for little league or play basketball with him.

So instead, he stayed home mostly and used the computer and got into "geeky" stuff.

The father's other children he had when he was younger are all very active, athletic, etc and none of them have to wear bifocals, etc.

I got into sports because my dad played catch with me and encouraged me to play sports because my dad wasn't old when he had me.

On the one hand, older fathers will be more established, but on the other hand, they will have more defective genes and less active/physical.