no, thats why you can never tell what age a chin is if you but them from a pet shop. From about 6 months onwards, they all look the same.
Sometimes, chins can grow freckles on their ears as they age, but honestly I don't think thats a reliable way of telling how old they are.
Other than size, i'm really not sure if there is a way. Maybe by examining their teeth? I don't know...
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