The problem is that the size of an animal of a certain age depends on many factors therefore the results will vary greatly from one individual to another.

How big out of the egg, how fast an hatchling is started, prey type offered, feeding frequency, fast period, strong feeder, picky feeder etc all that comes into play.

Bottom line if the snake is healthy and as a good body weight it really does not matter how big/long.

Here is an example on how greatly things can vary depending on the animal I have 1 year female that is 1000 grams I have a 3 years old female that is 900 grams (Those are are two example I have a few more snakes )