I'm in my late 50s and within the past 3 years have been to Madrid, Amsterdam, Berlin, and Torre Molinos multiple times. All 4 have excellent sex clubs, bars that host naked parties, and saunas that are great fun for men of all ages. Guys in Europe are a lot more sex positive than men in the US. I never fail to find plenty of partners from mid 30s to late 50s. Haven't done any hiring there so I can't comment on the rent boy scene. I spent a few weeks in Poland in 2017 and was pleasantly surprised at the availability of sex there too.