Welcome to the forums! Lots to learn here!
When you say "older" you might give a clue what that means to you. To those of us who are Senior Citizens.... "older" is very different than someone in their 30s.
Basically, read through information about what to look for in a Airstream... the older they are the more likely they need a new axle, need electrical upgrades, and floor repair. With the economy like it is today.... you should find a very usable trailer in good condition ready to roll if you do your homework! Start your search online, check out rallies that might be near you and go visit one! Folks love to show their 'streams at a rally and you can talk to real owners and get the lowdown! I'd start with a price range and size in mind and work your way from there!
Ask questions away, folks here are great to help out!
Mrs. NorCal Bambi traveling in S Tardis ~ from the Great State of Jefferson
My blogs: Yreka History
Siskiyou County Camping