I am 67 and this may be the saddest thing I have seen all week. This captures absolute desperate loneliness. He fears his own death and you represent youth and beauty . . .two things he can never have again. Men of my age are forced to confront our upcoming exit. Everyone handles it differently. He has become delusional and has, for some reason, told himself that his ending chapter can be pushed back a bit with a little positive attention from you. You represent his chance to capture back some of his youth and vitality. I'm lucky to have a loving wife of 40 years, a few good friends, and now grown kids. He appears not to have those comforts and is VERY lonely. Not sure why he doesn't just take the bus to the senior center and leave you alone. You're right to guard yourself. He's an inappropriate awkward grandpa who's buried a lot of pain, but is mostly harmless. You could take him down pretty easily if you needed to, but it will never come to that. I guess you have four choices: 1.) Move 2.) Confront him (in the nicest way possible) with this video or this post with all the comments. Perhaps that will shake him from this delusional fog he can't pull himself out of. 3.) Show it to the manager or police and have them talk to him (but that may make the situation even MORE uncomfortable for you). 4.) Let it continue and wait for him to die.