Hatchlings, Juveniles, Adults? Just wondered what the age ranges for these are, considering a Ball-Python can live for 20-30 years?

Also, is there a phase in their lives where they grow more quickly (like kids grow into adults and then stop growing!) or do they just continue to grow throughout their lives at a fairly constant rate?

The reason I ask is because I'd like to know how old my BP is and as I've learned from other posts here, you can't base their age on their length or weight as they vary so much.

(He's 3ft, 4inches long and weighs 770 grams, by the way. )

Many thanks...