And it is the old people who hinder the adoption of Bitcoin, because they are reluctant to use this technology which they think is inefficient and cumbersome. They prefer to use platforms like Paypal, Visa, or other conventional payment platforms compared to using Bitcoin, and that is a fact. They think that these Bitcoins are fraudulent and not real, so most of them avoid using them.
When this technology is adopted in all countries, the old people you are talking about will no longer be alive. And you will be in the old man's place by that time. So there will be no problems, since you will keep your knowledge about bitcoins and will help those who do not have them.