Stem cells that ‘get stuck’ may be the reason hair turns grey as people age

Research has found a reason why hair may turn grey with age (Kirsty O’Connor/PA)

It starts with one, maybe two, grey hairs, and most people put it down to ageing without thinking about the process that turns their hair grey.

But a new study suggests stem cells may get stuck as hair ages, and lose their ability to mature and maintain hair colour.