!rant !dev

I was just on my way to work back from the University cafeteria when a guy in a black car - who I thought was moving the car out of a parking lot - stopped the car and asked if I had a second.
Naive me, thinking he might need directions or something decided to listen to him.
He looked older, around 60ish, with sunglasses on ( making it harder for me to read him).
He said that he had a stroke (or something) a few years ago and got damage to his brain, so that sometimes it can happen that he would faint. Therefore, he cannot go swimming unsupervised, and was asking if I would have the time to accompany him to the university lake, so that he could swim for an hour or so. He offered to pay me 40 bucks.
Me, being paranoid af, declined politely, saying I have to go to work ( which was actually true).
He goes on to say how he was a teacher, how he worked at the university before, how I look trustworthy, how I am the first person he asks today, and asked if he could have my number, so that he could call me sometime to supervise the swimming. I would just need to look out for him not to drown and if anything looks weird I should alarm the people working at the lake ( lookouts? not sure what they are called).
I kept declining politely and he backed off, letting me go without any fuzz.
Previously he also mentioned how some students are rich, others are poor, and how he would have done anything for 20 bucks back in the day. But also said that he accepts a no and won't bother me further.

He also mentioned he wouldn't lay a hand on me, that he is not a creep, since I could see his car and license plate, and if I gave him my number, I would also have his. That I shouldn't worry about anything, if I later decided to say no he would delete my number, and that he is not big on the technology and Internet so nothing would happen.

Uhh... well if he was genuine I'm sorry for him, but then you can just ask authorities at the beach to pay more attention to you, no?
Mentioning "all my worries" raised a red flag for me sort of.
Also, if you keep on fainting occasionally, even if you haven't fainted in 2 years, how are you allowed to drive? Or actually, why do you even drive then?
I don't know. The more I think about it, the more I think I should have taken a picture of the car or license plate.
And there are literal services for this kind of thing. Pretty sure you can get one of these if you are willing to pay even.
Jeez now I'm worried for the entire population of my university...

Getting really pissed off with modern Mow-vember. I was there at the start when it was just about going the whole month without shaving. Now you need a worthy cause and well hewned face-fuzz. F*ck this noise.