At what age is a guinea pig considered an fully fledged?

I need to know so I'll know when to switch them over to Oxbow Cavy Cuisine, they're eating Oxbow Cavy Performance now.
About one year old
Normal or not? i purely get 2...
One year.
My hamster died have need of to...
Answers:    At age 10 months to 1 year, your piggie is considered fully grown. However, alfalfa base pellets should be discontinued at 6 months.
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