I'm not really sure, to be honest. I think they change and grow in certain ways their entire lives. Night was able to tell me that a rat I thought could have been a year and a half or older based on her condition, was actually between 8-12 months old just looking at photographs of her.
I guess they might stop growing when they become adults like humans. I saw a thing for how to work out out how old they are in rat years if you know what i mean-my gilrs are still teenagers.
jumpy? she started out running up, sniffing me and running away in a blurr. yeh she kinda hops some times, i wouldent say shes a proffessional popcorner tho!
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