I wouldn't worry too much about it--I think G1s are holding up amazingly well! The ones I have look just about new and they are almost 30 years old. I do think there are some ponies that are more prone to aging, discoloration, etc., and we know who those are. I keep my ponies stored in a cabinet that stands against an inside wall, so they are in a dark, relatively dust-free, temperature-controlled area. What more can I do? My friend though whose ponies were stored for 15+ years in a hot attic pulled hers down for me and they looked as good as mine! Ponies are quite durable.