'Grandma, why have you got gray hairs?'

says Lily, 4, dragging a particularly spikey brush through my hair.

'Because (wince) I need some more hair dye (ouch), darling,' says I, catching her mother's eye.

'You've got brown hair on top and (lifting a chunk of my hair up in the brush) gray underneath,' she marvels. She then decides I'll look good with a pony tail... And I do!