You know, having watched current age Keaton as an assassin character in The Protege, I became even more ok with the idea of him still playing Batman. Admittedly in my opinion Old Man Batman, if the city still hadn't gotten much better over the years, should rely even more on gadgets, spend less time on the streets, have a decades-built network on the ground to assist him, or all of the above.
Power to you. As someone who generally can't stand elbowing crowds a lot, going to the movies might be one of my top best outside activities, even with the odd bad experience,
Miller alone could warrant a good documentary if he keeps it up.