Well, I had a friend who at that time was over 60 years old, and he told me that he wanted to learn everything about computers, and I remember that every day I went and taught him, and in a period of 3 months he had a great level , he learned a lot, about internet searches, about what pages he could visit, what pages not to visit, at that time it was long before 2009, because Bitcin did not exist yet, but I am sure that if it had existed and I would have taught him, he would have acquired Bitcoin and I would have worked with BITCOIN, older adults are very intelligent and I think that a crypto casino would learn crypto very quickly.
There are elderly that can catch up with everything that they want to learn and it's only going to take them less time to be good at it. Although it sounds good to see them taking some touch with crypto and gambling. It's better for them to just enjoy other things than gambling. I agree to the concerns of the others that don't encourage them into gambling if they're already old enough because we don't know if they'll be compulsive and will start to react with every loss that they make. I saw some elder that have been through with that.
Much better if they can enjoy their remaining years into something more fruitful and meaningful for them.
We don't know if in the process of learning the crypto gambling, they will be addicted into it, and will pose problem for them especially financially.
But if they are really interested, you can advise them to do simple searches first over the internet, they can learn little by little.
They should not force themselves in learning all they need at a very short period of time, take time to understand and assess if this is the path they want to do with their remaining years of life.