Hi,
I own the full brother to the horse pictured at the top. The sire, Xenophon, the top horse, Andromeda, and my colt, Ardeo are all just greying. Very slowly though, and tail first. All 3 were born solid black, Xen's parents are a Friesian (black of course) and a grey Andalusian. The dam of Ardi and Andromeda is a bay Warlander, no grey gene. Ardi at 14 months old is still mostly black with some white hairs scattered all over him giving him some of that silvery sheen his sire and sister have. He isn't yet showing any grey in his mane though he does have a lot of grey in his tail now, hiding under the black hair. Xen at around 6 years old finally turned dappled grey with a silver mane and tail. Gorgeous. If anyone is interested in what Ardi looks like there're loads of pics on webshots that I've put in there over the months. Just search for Ardi or Ardeo and Warlander. He is a cute.