@Chris Mason I'm with you on that one! Although, technically, she's not really retired. ; -) Anyway: why do people (well, banks, really) focus so much on income from jobs?? I am lucky enough to have a very good one but the fact that I've been with the company for many years - what exactly does that prove with respect to me being able to keep that job in the future?? I could call my boss an, uhm, "very unpleasant person" and get fired and then what? I tell you "then what": it boils down to the fact whether I have money or not. Not whether I make money. Should the money I have also make money (e.g. dividends) then even better but the bottom line is, as one lovely person once asked me: "Do you have money or do you have to work?"
That really says it all. ;-)
So coming back to the retired folks: guess what, they have worked all their lives (let's assume that, for the sake of it) and have accumulated more or less wealth that now, coming from various sources most likely, generates a flow of income. What else do you want? Because, really, the goal of an investor-landlord is to get the rent (and for you as a lender to get your interest and ultimtely money back). I couldn't care less whether this is coming from the tenant getting prizes on dog shows for their poodle or from hard work they does himself. As long as that poodle-prize-winning potential tenant shows me their bank statements that show some reasonable money in them I'd probably be happy (with no red flags otherwise, of course). Could the tenant-to-be spend all that money tomorrow on a new super-poodle and have nothing left for rent? Sure. Just like an employee can get fired. Actually, you know what, I'd prefer that poodle-prize-winning tenant-to-be as he (she?) would be totally in love with the poodle and would do everything to keep it! If I get a judgment against them I could possibly get possession of that valuable poodle and auction it off at a poodle-lover auction! The person would never allow that and rather pay up. Ha! (and no, I'm not being entirely serious here ;- ) ).
@Robin Cox We are in the business of making money. Don't be stupid by on-boarding everyone you come across but also don't be stupid by excluding perfectly fine opportunities (= good tenants) simply because they don't have a W-2 (there was another thread about a trust kiddy; I'd jump on that immediately if it were me in the context of financial security - but the kid of course needs to otherwise be a viable tenant, which, uhm, sometimes can be the main issue ;-) ).
So with retired folks we as landlords actually are in an even better position when looking at "job security": you can't get fired from your retiree "job"! SS will pay as long as you live and so will, typically, pension plans. So just like @Account Closed said, have him provide you with proof of income/wealth. Anything he will present, that will corroborate the above, should satisfy you, I'm pretty sure about that. Good luck!