I read this article, too. It's true that Ryanair's 732s were built in the early 1980s. But does this make them unsafe? No, there has never been a Ryanair accident up to now. If you ask me, it's only Stelios who plays dirty when telling everybody how unsafe those 732s are. Airlines like BA, LH, SK or AF still have 20-years-old aircraft in their fleets, are those airlines unsafe? And looking at the Ryanair 738 delivery schedule (and the 732 retiring schedule), we can be sure that Ryanair will have one of the most modern fleets in the world.
I have to agree that Ryanair pilots do not have much time to relax between the flights, and flying two return trips each day (with only 25 minutes ground time between the flights), they must be stressed I'm sure, it must be much more stressing than one 10-hour longhaul flight. This is the real safety problem imo, but do Easyjet pilots have less flights each day? Do they have a longer ground time between two flights? I don't know.