I agree with this, to a certain extent. An umpire's strike zone should be different for an eight year old starting out than it is for a sixteen year old who has been pitching for six years. 100%. We have a much bigger strike zone for our subbies kids. But it starts getting tighter the better (usually faster) the pitcher is)
Where I don't agree it should be different is when you have a pitcher who has pitched for six years playing a pitcher who has just started. You can't have a different strike zone in the same game. It has to stay the same.
I agree that the strike zone of a 10u vs a 16u pitcher should be different. What I don't agree with and what the ump was refering to ....both pitchers 10u in the same game he had 2 different strike zones.