If it's an adult, it's impossible to guess the age. Sub-adults are more easier and could be guessed with a one or two year discrepancy. Can you take pics with a tape measure next to it?
steamd rice wrote:i was told by the petsmart employee it was female but idk how to check properly.
Males have longer and thicker tails and longer front claws by the time they reach the 4" mark. There is a section of the site that explains that.....Look for it.