Why doesn't CONCACAF have its u21/u23 tournament every two years like UEFA does instead every four years as it currently does?
https://en.wikipedia.org/wiki/CONCACAF_Under-20_Championship#Results says CONCACAF has had a U-20 tournament every odd-numbered year since 2001. https://en.wikipedia.org/wiki/CONCACAF_U-17_Championship#Results says CONCACAF has had a U-17 tournament every odd-numbered year since 1999. CONCACAF and UEFA have different youth age groups. CONCACAF has three youth levels, U-23 (Olympics, held every four years), U-20, and U-17. UEFA has U-21 (which they use for the Olympics), U-19, and U-17. UEFA doesn't have a U-23. Since the youth World Cups are for U-20 and U-17, I think the way CONCACAF does it makes more sense.