I just did a quick online quote with heritage, just out of interest.
I'm 38, never ever claimed on my insurance,garaged, in a nice area, limited to 1500 miles per year.
Ready - £700 yes £700!( and the excess was £1100!)
that's the same as what I payed for my 944 2.5 when I was 23!
I don't know where these people get their quotes from. I currently pay £200 with Swiftcover.
What gets me is that they advertise in Porsche Post,thus giving the impression that they are specialists in classic cars. I've had better quotes from direct line, swinton, etc.
What I'm saying is shop around, a lot. And I'm sorry to say it doesn't seem to get better the older you get. I remember being 23 & thinking when I'm 25 it'll get better, it didn't. I wish someone had told me that back then!