Was 25 when I bought a brand new 1975 Dodge Tradesman van. Built a bed over the wheelwells, put 2" of foam down for the bed, paneled the walls, put in a roof vent, and some nice long two-tone green shag carpet. Talk about living the high life.
It wasn't until age 44 (1994) that we bought a real RV, a new 20' Chateau TT and then in 2003 (age 53) a 2 year old Cardinal 5th wheel, which we still have and use regularly. Just spent 6 weeks in it down in Florida. I've got my eyes open for different 5th wheel, but not looking too hard yet.