Silly question about colouration

I have a JCP which is under a year and right now its a dark colouration an dI have been telling my friends that in another year or 2 it will brighten up. They are telling me it won't so my silly question is how long must I wait before my JCP brightens up or until I'm proven wrong?
Mark

most will continue to color up for about 18 months, depending on how much you feed it and how well taken care of it is. i once got a carpet secondhand that wasn't very well taken care of and even though it was already about 18 months old, the color really took off after a couple sheds because, i fell, better husbandry.

but yes, you are correct... how much it colors up will depend on the genetics of the individual animal though.