My Goldfish has missing scales; what do you think it is? (Pictures Included)?

is they in the dark? This is a weird fact, but if you leave a goldfish in the dark it will eventually turn white. so i suggest putting them some litter place, but don't put them in the sun or under a lamp because that'll probably cook them. oh, you've had them for 10 years, theyre just getting older, don't worry about it. they will probably grow their scales back.