Guinea pigs reach adolensence at 3-5 months. Dont flip out- my male is about 7 months old, however he has been laid back all his life. Guinea pigs have different personalities just like you & me. I wouldn't worry about him unless his "laid-backness" turns into lethargy.. meaning he rarely moves (perhaps due to pain?) or his diet changes. in that case get him to a vet!
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