I'll just add to the general theme here.
I too was very concerned about this question as I was considering buying a 1997 Boxster with just 32,000 miles on her. I asked a lot of questions and came to the conclusion that if:
- the car has been properly maintained and there are records to demonstrate this
- it was preferably garaged
- the car is inspected by someone who has experience with the specific car and model
Just about any "old" car can be purchased with confidence.
So, in my case I purchased my car at 32,000 miles and I have just over 38,000 miles now. This is hardly a good data point for you as I'm just getting started, but for what it's worth, so far so good. From what I was told, if seals and hoses were going to be a problem, they would become a problem immediately. If they didn't rear their heads right away, I should be good.
Point is, do you homework, be thorough and objective in your research (in other words, try not to get emotional about the car, yet). And you'll be good to go.
Good luck!!