first of all 18 isn't young, people can get married around that age here.
second why should the fact that you've seen so many old movies mean anything? why are they better than more modern contemporary films?
according to Letterboxd I've seen around 393 films and 316 of them are from the 2010s and I don't see what makes modern movies any lesser than films made from the 20th century. films like Parasite,I Saw the Devil, Roma, Captain Marvel, A Star is Born, Midsommar and Capernaum are as valid as anything made from decades ago.