A very high percentage of successful single 30+ females I know are online dating. Remember most of us at that age are too busy to just "hang out" looking for someone with no specific goal in mind. Of course it's also full of fatties and going-nowheres but you have to wade through the flotsam everywhere you go. What is, in your 20s, a way to find f-buddies becomes, in your 30s and 40s and beyond, a cornerstone of meeting women. This goes against manosphere gospel but is just a reality.
Social circle and "match making" play a part in "vintage dating" too. Married women are always trying to get in single people's business and pushing off their single friends onto their husband's single friends. Again, some of these women are "the single friend" for a reason, but some are getting out of relationships or single for other less offensive reasons. If you're a solid guy I'm sure some of your friends have tried this route. Keep your eyes open when they mention single women within their orbit.
As for meeting girls under 27, day game is the best way. If you are that mature, sexy, clean, fashionable, charming guy that comes into their restaurant, doctor's office, or store you are a story they can brag about to their friends. Nothing gets you laid faster than being a fun story they can chat about on their coffee break. Bonus points if you can pull it off in front of their co-workers. I work as a nurse with women primarily of this age group and I see it all the time. You must be able to project a better image than most of the douchebags they are dating and charm their friends during the quick interactions. The key to these interactions are you being out and about and jumping on the situations as they arise in your normal day to day. Start eating out more, drinking at the local bars, going into the bank instead of using the ATM, going to stores instead on online shopping, essentially living like we used to before tech took over.