How Long To They Last?

I am a very thrifty person and we keep our things until they just lay down and die so I am wondering how old is your TM. This will also help me to decide if I want used and maybe the years that I would want if we don't buy new. Everyone sort of thinks that trying to keep our 1993 van (very nice, well-maintained Ford Club Wagon) running isn't worth while. We bought it used in 1996 paid it off in a couple years so haven't made a payment in 7 years so it allows for the repairs. Looking for something similiar in a travel trailer. So, how long could we keep the TM going if we take care of it? Thanks, Cathy