Bought my guinea pigs starting Aug2021. Tututz is male who is now ~2yrs old. He was the first one i bought at 4months old. And then thought of looking for a male companion for him as i have read that they are social animals. So i bought Natnat last Apr2022 at about 3months old. However the pet store mistakenly gave me a female and only realized when natnat got older (since gender for GPs can get confusing at an early age.