I think racing at 4 would sought the men out from the boy's, personally when i'm looking at a stallion for my mare's i like to see that horse race in the open ranks. Horses such as Artsplace and Art Major raced at 4 with great success and it also goes to show how strong and sound Art Major was as he had a big 3yr old season of 31 starts for 20wins and 5 places and then come back at 4 for 11 starts 8wins 3 places.