KunstlerCast #146: Geritopia The KunstlerCast
The author, Andrew Blechman, is interviewed and describes Mr. Midnight. I think he slips and refers to him as Joe at some point. If I recall correctly Liesureville was published in 2008. Andrew refers to Mr. M as being in his early to mid sixties at the time he met him which would make him about 70 today. Reputedly he was a biology teacher from a midwestern state, I forget which one. Of course that could all have been dressing to hide the guy's real identity.
On my 2011 visit some construction worker hanging out at Katie belle's claimed he was Mr. M but he was in his late fifties and had no class. The manner in which he approached women was aggressive and a bit crude, very different than Mr. M's technique as described by Blechman.
IRL I know a few Mr. Midnights. They do exist.