@Colin ********
you are correct in order to get a Non-O visa or a year extension based on "retirement" you have to be 50.
As I said with your history, find a service in pattaya that will mini-van you to the border, (that has already greased the wheels) so that it's a smooth stamp out, stamp in and out of cambodia and then stamp back in to thailand.
Bouncing on your own is not near as easy post-covid shit show as people think it is.