Leopard Appy's black legs turning white?

Yeah, although I suspect he had dark legs with lightning marks, which generally color out to be either mottled or spotted - pretty common in Appys...

Yep that would be my guess as well Face. Kind of like Lard Butt is turning into a white horse

I think Age has more to do with losing color. I had a very old leopard appy by the time he died he was white. He in tiime lost all of his spots to in the case of the largest ones little black hairs the smaller ones no white. It was so slow of a change I even forgot he had larger spots. But looking back at photos they are clear as day.

^^ Welcome to the forum...

No sorry, that that has nothing to do with Age. Varnish roan/LP roan is a progressive color change that is different on each and every horse. It is similar to grey in that it continues to "whiten" a horse throughout their lifetime.

It may be but he got white after he became 30. Until then it was a progressive whiting. So in my eyes unlike many color breeds that carry their color to death many with white hairs in the dark with age appy's change in most cases I have seen is whiting. Maybe slower than the Lipizzaner but in the same general direction . As the appy's aged they became white. I only owned 2 but there are many in the area that did as mine did. The second one I had died in her late 20's but she was 90% white coming from a blanket appy.

What ND is saying is that, while varnish (the gradual roaning out to white effect that many appys have) is related to the passing of time, it is not actually related to age. Same goes for grey. Both are progressive, in that the horse will keep losing colour until either they pass away or they are completely white. However, this process van vary hugely depending on many factors. Some appaloosas with vanish never lose all their colour, some are coloured out by the age of 5 or so. Same with grey. I have seen a yearling that was completely white due to grey and silver having a fun time together.

Grey and LP together on a horse causes an extremely fast greying process as well.