Situations and abilities vary, bonzo...

Neither of my parents (86/87) cope with Internet banking these days although mum is usually OK once I get her logged on. Dad hasn't managed to make payments for things like his newspaper bill (paid by bank transfer) or his council care bill (paid by card) in a few years and I have to make the payments for him. I have his banking app on my smart phone for this (and do have power of attorney). I do log them both on to their accounts every week or so to let them look through their accounts but also try to keep an eye on their accounts myself in case of anything untoward.