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According to my predictions in Sun/Moon/USUM, Colress is around his mid 20s to early 30s (given SM/USUM is set 2 years after B2W2). Somewhat older than Molayne, but around the same as Olivia and Grimsley, or younger than Lusamine (who's in her 40+).
And yes, Sophocles might be around 13 to 17...
There is no age restriction for the Elite Four and Champion (even 10-year-olds can be in Elite Four or Champion), so Acerola is around the same age as Hau, Lillie or the player character (something 11, but Acerola is very smart for that age).
Also, Eevee users' ages here.