Old age advice was essentially selling the idea that her attraction is entirely in your control. If one is ever rejected by a girl it just means (and only means) your 'game' wasn't good enough. If you are 75 and obese and the stunning little 19 year old girl rejects you, it's a 'game' issue. Not a looks or age issue or whatever. That would be called a 'limiting belief'. You simply need to 'create attraction' (buy my course on how to do this). Depending on whose old school model you used, that could mean negging her. Or telling DHV stories. Or using canned NLP seduction patterns. For Slightly more modern PUA's it would be 'teasing' her, maybe cold reads and just being 'free from outcome' in general etc
It was always a load of nonsense tbh, but it wasn't until youtube came along, amongst other things, where sharp eyes were slowly able to see that the coaches themselves couldn't achieve this miracle. And people were slowly able to spot patterns over thousands of infields. Namely that pulls were always on the 'yes girls'. Girls who were basically into it at 'hi', and the success was in spite of their routines of whatever. Not because of it. Out of maybe 10,000 infields that have been released, we've basically never seen a pull on a hard 'no girl', despite the fact that for the original PUA model to be true, we should have thousands of them! We should have endless infields...thousands(!) where some very ugly, old guy approaches a 10/10 stunner who ignores him and tells her she has a BF. He says 'how long have you had that problem?!' or 'I've got a gold fish....sorry, I thought we were talking about things that didn't matter' or one of many cheesy PUA lines, then negged her etc etc, and then she starts trying to seduce HIM due to her insane attraction levels lol.
I remember Julien joyfully sharing an infield where he was able to make a clear 'no girl' who was basically ignoring him, say a few words back too him. That was all he got out of her. No lay. No kiss. Nothing. And he clearly thought that was a big acchievment which kind of underline how likely it is that one is actually going to BANG a 'no girl' lol. If we are celebrating getting her to say a few polite words!
Luckily the community has MOSTLY gotten away from that disney thinking, although there are actually still some forums and sub reddits where some unfortunate saps are still hanging onto that idea (Mostly people who are selling coaching of course. So they don't actually believe what they are even saying! There's no integrity when it comes to making lots of money lol)
Nowadays though, most people know that her telling you she has a BF means either 1/ she does have a boyfriend, or 2/She is lying about having one so that you go away since she's not attracted to you, and nothing you can say will change that lol
The general 'model' of PUA nowadays is much more concentrated on being your best self (getting lean is the most popular one. Also dressing better, getting your money up etc) and then essentially playing the numbers game. No real 'rules' as such in terms of what to say etc.