It's a bad idea teaching old people to use bitcoin. Mostly old people in my country don't know how to use cellphone or computer. But if they knew, what will be in their mind if you introduce bitcoin to them? In news, bitcoin always mention because in our country many investment scam use bitcoin as their mode of payment. Old people always watch news, and if I'll introduce it to them they'll avoid it and think that it is a scam.
Lol, why say it's bad, actually it will be really good if everyone get acquainted with bitcoin, to increase mass adoption, is not like bitcoin is only for the young ones, my pops knows about bitcoin, but sadly as you said most old people don't know how to even operate a smartphone or a computer on their own, talk more of performing a transactions using bitcoin,i think they see feel everything about this digital age is complicated and during their time they never came across techs like this modern age, so that's why hardly understand anything involving tech.