I've seen some parks with an RV age limitation. The information below I copied from Golden Village Palms RV Resort, where the California rally will be held. When I registered they asked me age of RV and condition.
Yes. All RV’s must be fully self-contained, and are subject to an exterior inspection upon arrival. The RV must be clean, rust free, no broken windows, tarps for roofs and other modifications are strictly prohibited. Sorry no tent camping or pops allowed.
Steve and Paula
Tiki (Our Papillon Kid) RIP Chance
2015 Ford F-350 Platinum DRW, 6.7L, 4x4,
Hensley TS3, 20k hitch
2015 Cedar Creek 34RLSA-7, fully loaded
Nights camped - 2014-47, 2015-104, 2016-97