First to find natural wonder. Splendid Holy Site. City of Awe. Ancient Era religion founded. That should seriously be enough to get a golden age, in my not so humble opinion. But no, add everything together, and you get 12 points here (including Great Prophet). Add one for Pantheon, two for two civs met (pretty average), two for a barbarian camp (pretty average), throw in two random points for tundra and city near flood plains, another two for becoming a city state's suzerain in the ancient era and you're at... Exactly. 21 points. Four more needed! Just what do you need to do to hit that Classical Era Golden Age other than hope that you happen to get your great start exactly in a game where you have an ancient era unique unit/building/district/improvement?