A few months ago I developed a bunch of films that had been stashed away for 20-25 years. It was a mixed selection, but this is how they came out.
Tri-X ~15 rolls: OK. a slight base fog fairly easy to print.
Agfapan 100 ~20 rolls: Excellent: very very slight fog on a couple of the rolls, but most of them looked like they were new.
Agfapan 400 ~10 rolls: Bad; Heavy base fog, will be a PITA to print, One roll probably unprintable
Kodak Tmy400: ~8 rolls: Not very good. Pronounced base fog, very grainy even on MF. Not very hard to print.
Kodak Tmy100: ~8 rolls: Like the 400 fogged and with pronounced grain.
The result within each group of film were very uniform, except for the odd film that were totally black (3 Trix, 2 AP100, 1 AP400) or unexposed (mea culpa).
For the TriX I used D76, for the Agfas; Rodinal, and for the Kodaks; T-max dev.
I still have a few rolls left to develope. Next in line: A bunch of Ilfords, some 3-4 PlusX and a single Panatomic X.
will report back -- MW