How old is too old?

Empty Nest, Soon wrote:
We're looking to buy a used motorhome (our first.) I'm leaning toward an older higher-end MH, such as Newmar, in order to get the features we would like within our budget.

I would like the MH we buy to last for 10 years and be reliable if we give it good care. I don't mind doing the simple maintenance items and repairs, but I'm not looking for MH renovation to become a hobby. I will probably hire all significant work done.

Right now, I have a reasonably good comfort level with buying a 10 or 12 year old Newmar or equivalent MH that has been cared for and is in good condition. I feel that it should last another 10 years without maintenance issues becoming enough of a problem to cause me to sell it. Is this a reasonable expectation? How old is too old before it figures to become too much of a pain in the backside?

Thanks.

Wayne