My gym is in the middle. On the Xcel side, Our Lower levels (Bronze, Silver) are more prominent in the older age groups, with a lone few in "Child A, JR," (etc). Compolsoy/Optinols are pretty average for my region (2). Most of these older girls (in lower levels) haven't repeated levels; they just start late.
Dev/Compulsory:
Pre-Team (LvL 1, 2 Local Meets) 5-7
Level 2: 6-9 (With the exception of a 12-year-old)
Level 3: 7-10
Level 4: 9-11
Level 5: 10 (Two of them, Both 10)
No Level 6
Level 7: 12-15
Level 8: One lone 13-year-old
No Level 9
Level 10: 15-18 (two of them)
Xcel (At my gym, we call it Xcellarate). Xcel at my gym is fairly new. After 4 years, we have XB, XS, XG, and XP.
XB (Xcel Bronze): 7-10
XS(Xcel Silver): 9-14 (exception of an 18-year-old) Average: 11
XG (Xcel Gold): 11-14 (6th-8th)
XP(Xcel Platinum): 13-15 (three of them)
No XD (xcel Dimaond) or XSA (Xcel Saphairre)