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At 21 days old they need to be sexed, as that is when they are (possibly, but better safe than sorry, especially with young pigs) sexually mature. It is quite difficult to tell them apart when they are this young, but just try your best. Going online and printing out pictures to take along when you try to figure it out is quite helpful. I would keep on checking them for a while, just in case you did make a mistake.

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12y ago
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13y ago

You can't actually tell how old but you can ask the vet.

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Q: How old does a guinea pig have to be to tell the gender?
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