Here's 12voltman's loaches. If I remember correctly they are at least 10 years old. And as you can see they have those faded lines but are still only about 4" or so. I think what's more rare is to have old loaches. Most clown loaches don't even last a year so that's probably why we don't see them as often.
http://www.monsterfishkeepers.com/forums/showpost.php?p=880274&postcount=12
http://www.monsterfishkeepers.com/forums/showpost.php?p=880274&postcount=12

