At what age do they stop growing?

[Dakonic]

That is good to know. I like to see snakes fed and grown to their full potential. It's what nature intended. People who underfeed their snakes to keep them small piss me off.

"The number one mistake most novices make is over-feeding. Boas evolved to sustain themselves on a minimal amount of food. You need to guard against over-feeding and obesity. Of course you don't want to starve your boas either, and the goal is to maintain a healthy weight. A young boa will thrive on a single meal that leaves a slight lump, once every ten to fourteen days. This regimen will produce a slow but steady growth rate that the animal can maintain itself on until adulthood." - The Complete Boa Constrictor by Vincent Russo