The only change you can throw all game long is a knuckler. When I played babe Ruth league I couldn't get anything over the plate so I started chucking knuckle balls. The way it floats up to the plate the kids almost jump out of their shoes swinging at it only to whiff or hit a weak grounder to second.
If you could still throw a serviceable knuckleball, you could probably still throw an inning or two in the majors.
An 80 year old can throw a serviceable knuckle ball. The beauty of the knuckle ball is once you get the grip down you just lob it in the general direction of home plate. That's all you do. When I tried to throw hard I made "Wild Thing" look like Greg Maddux. My coach used to tell me, "just pretend you're playing catch with the catcher and forget the hitter."
