Seals and gaskets are very common on vehicles that sit for a long periods of time then are required for daily use. Seals and gaskets dry out and get brittle from none use and the absence of oil circulating around them.
I have purchased many older vehicles over the years with low mileage and this is usually the issue with those low mileage gems that you find in granny's barn.
08 Black and Khaki JK Sahara Unlimited, Dual Tops, MyGig, Tow pkg, Trax-Lok Rear Diff,
Mods -- 3.5" Rock Krawler front springs, 2.5 TerraFlex BB, PitBull Rockers 35x12.50x17 on BlackRock Vipers, AEV Premium Bumper,