In the forties hair also begins to lose its colour and grey hairs flourish in large numbers. In reality these hairs are not grey but colourless as, due to aging, the production of pigmentation has slowed down (eventually to stop altogether) and individual hairs have become colourless. Mixed in with hairs still coloured the colourless hairs appear grey; as soon as every hair loses its pigmentation the head of hair appears white. Some of us change colour sooner than others and without dye there is no way of re-activating or restoring the hairs’ colour. Aging kills off the power to produce hair pigment.
Curiously enough although many men go bald as they age, so they also get hairier. But not on the head. Eyebrows start to grow, hairs shoot out of the nostrils and ears. All three should be trimmed if a man is going to look his best — and younger. Hair protruding from ears and nose is universally regarded as a sign of age.