Vitiligo is similar to piebald and patches, but also kinda different.

Vitiligo is where the main skin color comes up as patches that slowly get bigger as you grow older.

I think it would be cool to add this!

0-6 months
Small little blobs around

7-14 months
A bit bigger, more patches around

15-21 months
Some big splotches all around the body, paws and tail tip slowly becoming normal

22-28 months
Paws and tail completely colored regularly, face almost filled

29-35 months
Face completely covered, body almost covered

36-42 months
Body covered completely, mane color if male starting

43-49 months
Mane color getting bigger

50-56 months
Mane half way done

57-63 months
Mane almost done

64-70 months
Mane fully colored.