I have a WW2 RAF flying manual for the Miles Magister. The syllabus is very similar to the current RAF and PPL ones. The lesson numbers course construction are almost identical.
Although aircraft have different characteristics, the laws of aerodynamics don't change and the best way to recover from a stall with minimum height loss has not changed since then.
And until we're all flying hover cars, I doubt it will change much in the future either!