how old were the members (all/any units) when they joined SM or the first time they spent as a rookie there?

ive been looking at oldddd old pics of all the nct members back in the predebut/early sm rookie days and obviously they all look like actual babies lmao (mostly bc they basically wEre but yk)

and i was wondering if anyone could tell me how old members were when they joined/when they were early rookies?

google is telling me all sorts of different things and no clear answers😭😭 (obvs exclude wish bc they're still so new so it's not the same as 127, dream and wayv)

i dont expect anyone to tell me all 25 bc ik thats a lot of ppl lol but just whoever you know and are willing to share with me😭