Coming from an international perspective, I feel like tumbling takes longer to learn than stunting, and it doesn't come as easily the older you are. We don't have the "cheer culture" that America does which feeds kids in from when they are young and develops their skills as they grow older. Our cheer community has mainly been started from older athletes (although we are beginning now to get that culture where kids are starting younger and younger) and I feel that progressing to elite stunting skills comes a lot easier for the majority of people than progressing, in the same time frame, to elite tumbling skills.