Old pilots - still good?

[Orchidius]

Hi there,

Just wondering how old your pilots and cruising guides are when you chuck them in favor of the newest edition. I've been lucky enough to receive a bunch of old pilots for my trip from a friend in the marina, but they're all fairly old, some even downright ancient (1987). Now I'm wondering if these are worth using, or that I should buy all the new ones (a substantial investment).

The route I'll be sailing will start in Europe, to the Caribbean and back again.

[Orchidius]

Bump.