8 Reasons Why Grey Hair Happens - Even On The Young!

Like wrinkles, grey hairs are a visible sign of ageing - and let's be clear, there is zero, zilch, nada, nothing, wrong with that. It's a part of life - and a beautiful part at that. But if you've ever wondered just what actually causes hair to change colour over time, you're not alone... Trichologist Madeleine Preston, explains the science behind going grey, from what triggers it, to whether it can be delayed (should we actually wish to).