Well, senior moments certainly figure in my life these days, but I was never good at remembering actors real names. I commit myself totally to believing in the film or play in front of me at the time, and know the characters by their part-name. This is especially so with theatre, but it happens a lot in films, too.

Even when I worked in the theatre, I tended to think of the actors there in terms of there current stage part! (which used to piss themn off no end! But that's the way I am, folks!)