Well, my hatchlings are about 4-5 months old and weigh in at 9 grams (the smallest) and almost 20 grams (largest), 12 inches to 16 inches. I have a yearling that weighs 68 grams and is approximately 2 feet. I also have another yearling that is only 22 grams and maybe 14 inches. So, as you can see, age isn't always a determining factor. Growth is very dependent on how much/often a snake is fed. :}