Fully agree - nail on the head.
We've had "home" computers for 43 years, ever since the first commercially affordable one was introduced, the sinclair ZX80 (there's a clue in the number - 1980!) closely followed by the ZX81 and then the Spectrum, (of which 5 million were sold). I'm pretty sure most people in the 1980s used either a home computer for playing games on their TVs or even those earlier "ping pong" tennis games for the TV, or similar.
I started work in a small office in 1983 - just 9 employees and the father/son owners, but we all had a computer on our desks - that's 40 years ago! Anyone working in an office environment in the mid-late 80s and certainly in the 90s would have had exposure to PCs!
My wages were paid into my bank account right from the first pay day, and I had debit and credit cards in regularly use that first month of working, as well as using ATM machines to draw out cash, cheque balances, etc. I'd go shopping and mostly pay by card in all the bigger/chain stores. Although, yes, smaller independents didn't tend to take cards back in the 80s, some did, many didn't. I remember having to get a M&S credit card because they didn't accept VISA/Access credit cards back then - they only accepted their own, but that soon changed!
Telephone banking started in the mid 1990's - around 30 years ago, roughly the same time as mobile phones. Smart phones became widely available 10-15 years ago.
Wake up and smell the coffee - the writing has been on the wall for 40 years. It's literally nothing new and the direction of travel has been blindingly obvious for four decades!
Today's 80 year olds were only 40 back in 1983, in the prime of their lives, presumably mostly working. They had ample opportunity to get on board with debit/credit cards, telephone/online banking, etc.