Domains are like wine, they get better with time.
Might be worth it - lot of backlinks? Is the PR real?
Another factor is if it's been abused in the past, it takes quite a bit of time to rehabilitate a name. As one example, I have had one name for over two years that used to be a porn name, I've used it for a couple non-porn topics since I got it, and a lot of other sites still think it's a porn site. I may just have to give in and start serving midget porn on it.
If the name fits your project and has some positive history, definitely ++.