Listen, unless you're trying to meet every dang youth in the town, it won't matter if they have "the most". Any major city will have plenty of people your age to chill with. If anything, you should be looking for the city that fits your vibe better so you're actually chilling with the kind of people that you'd enjoy being friends with. Age is a useless determiner of whether or not you'll actually enjoy spending time with someone in the grand scheme of it all.