system
Given the following post, respond as if you're commenting on Reddit:
human
Is there a test that can accurately predict a persons age? i.e if you don't know your DOB.

I recently watched a clip from one of those border control programs, which featured a man claiming to be 15, at the end they said they took him to get an age test, so I'm wondering how they can test your age? What an age test would entail? And how accurate can it be?

Googling gives me a bunch of "mental age", "heart age", "maturity" tests, which is not what i was looking for.
gpt
Age tests such as teeth structure or even bone structure are very inconclusive since children mature at such varying timespans, children of the age of 12 or 13 can possess the same anatomical characteristics of say a 20 year old. 

So far, no test is actually legitimate. Only ball park guesses.