If an undocumented migrant is a minor or an adult can have far-reaching implications. A forensic anthropologist explains why relying solely on dental X-rays to determine age doesn't work.
We may not be able to 'age backwards', as some jellyfish do, but research is slowly revealing the secrets of successful ageing for humans.
Various tests claim to be able to tell your true age. Here's how they do it.
Bio-banding is all the rage as youth football seeks to make the most of young talent. Here's why we shouldn't get carried away.