Purchasing an older home -- how old is old??

[Mary]

I have begun looking for a mobile/manufactured home to buy, and the older ones are so much more affordable, of course. However, I'm concerned that the older a home is, the more problems, etc.
I realize that it somewhat depends on who lived in it, how they took care of it, etc., but I know that things wear out and so on.
How long does a home last? Are there any guidelines as to how old is "too old"? For instance, I've read that HUD guidelines for construction were not passed until 1977, so I'd never consider one built before that date.
Also, if I purchase an older home that needs some renovations, are renovations worth doing on a home? Do they bring it up to "nearly new" condition so I won't have to worry about it?
Are older homes more difficult (or impossible) to insure? I know loans have a higher percentage rate for older homes.
Thank you to anyone who replies. As a first-time buyer, it's scary out there! If anyone can recommend a good book that will help guide me, I'd appreciate that also.

[jgn]

I have a 1976 DW that I have had for 11 years and have the same problems with it that i have with my primary home that is a 1986 brick site built. If cared for any home will out last it's owner . There are things to look for in an older home just like a new home. Get a good home inspector who is familiar with MH and you will be fine. I am thinking about replacing my MH not because it is old just because it is more cost effective to replace than remodel with all of the changes I want.

[Jenny]

I have a modular home now on a foundation. Is it possible to remove the one I have now and replace it with a newer one. I realize that some changes to the foundation may have to be made, but is it possible to do this.

Just curious

Thanks

Jenny