There is now way to find out how old it is but you can find out when it is fully grown when the black lines on it's head have gone.
they are fully grown when they are 6 years old
Fully grown physically at one year old; fully grown emotionally at between twe to three years old.
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6 years old
Adult. Most guppies are fully grown at a year old.
Budgies are as smart as a 3 or 5 year old person.
To breed, two and a half, to be fully grown, three.
A gerbil is full grown by 6 months old and measures 7-8 inches including the tail.
No some ladies are that hieght fully grown
if that five year old is a haas No. Their genitals aren't fully grown yet.
They're fully grown at around 8 months of age, or up to one year of age, but they are only considered to really be an adult dog when they are two years of age.
By the time baby platypuses are two years old they are fully mature.