I make it a point to never date without knowing age, regardless of how loose.
if I was more like you, I wouldnt have wasted the best years of my life.
Luckilly, film wont cheat or dump you (ok, well, the manufacturers might
), so just give it a try and see how it goes. If you get something good, awesome. If you dont, then you're helping the photochemical industry. If you think the film is years past expiration, overexpose a stop or two, develop normally, and tweak with VC paper. At least, that's the advice I remember reading. Never personally used black and white film so out of date I needed to use this advice