You have to be really really careful. Most of us learned about technology when we were young, before we had credit cards and retirement plans. Handing an old person the internet, opening them to the world of scam artists that implies, is very dangerous.
When working with seniors one must also be ready for stereotypes to be true. Not all old people have bad memory, but many do. It can be very frustrating to work with someone every day only to have that work disappear overnight. Often lack of memory manifests as aggression and paranoia. It is not unusual to work with someone every day for weeks, only for them to suddenly accuse you of stealing. You have to be ready for these setbacks.