At Petsmart, betta fish are typically available for purchase when they reach 4-6 months of age. Depending on the specific species, size and coloration of the fish, some may be older than 6 months when you find them at Petsmart. Generally speaking, betta fish from a store like Petsmart will be considerably younger than those purchased through a breeder or directly from an importer who specializes in importing young adult or mature stock. Bettas that have been bred in captivity can live up to 3 years with proper care while wild caught specimens may only survive 1 year due to increased stress levels caused by shipping and handling practices. As such, it’s important to understand your source before purchasing any pet so you can provide adequate care throughout its lifespan!