grayson joined batman when he was 10, left when he was either 18 or 19, i believe it was 19....not sure about jason todd, he came along in 1983, and died in 88 i think....i would guess he was like 12-14 when batman took him in and 16-19 when joker killed him, i'm not sure when batman took in drake, i think 13 or 14, but i'm just guessing...he was around 17 in identity crisis
That's not correct. In "Hush", Bruce reflects that he wishes he could have lived to grow up to 18... the same age as Nightwing! So I guess they're younger or older depending on the idea of the author... in War Drums it said tim's between 14 and 18 and the intro to Death in the Family gives a bit of an idea