Supply of AZ is so limited in the EU that the EU can afford to be more conservative with recommendations; it's not like de facto restricting AZ to 60-75 (common in European countries) actually slows down vaccination, because there isn't enough AZ available to vaccinate that age group anyway; even if all the AZ is dedicated to it it some of that cohort end up getting Pfizer.
In many EU countries, the vaccine was banned for large segments of the population for extended periods of time.