He should be able to learn to cast well enough to catch a few fish. That said, one of my best friends picked up fly fishing when he inherited some old fiberglass rods from his uncle. He will never be a master caster but he caught a bunch of warm water fish and a few trout. He will soon be 70 years old, he is a decent hack golfer, plays soft ball, plays pickleball (look it up) and is decent dancer for an old white guy. He struggles with a spincast rod, my 8 year old grand daughter is better with one than he is. It depends upon the individual, he obviously has the motor skills, compared to consistently throwing a ball in the strike zone or to the first baseman, from the outfield to a point ahead of the runner takes a lot more motor skills than fly casting, unless he wants to be a exhibition caster.