At that age, ime, like with my dad, it's best to speak in terms that they understand. I pitched my dad with the "an X% allocation to bitcoin will improve the overall performance of any portfolio." That got him to get into an ETF, and he saw gains very quickly from it, then began wondering if he should put a higher, Y% in.

We talked a lot about why the ETF isn't ideal and why bitcoin is so much better than any other financial asset in terms of confiscation and freedom and manipulation, which he got as a Persian immigrant, but he's getting on in 60's now and was honest about how much responsibility he wanted to take on.

What's nice is that he talks to his side of the family a lot, and much of the younger generation back in Iran, and will probably get them all interested, imparting how for their age, in their position, they should be custodying it themselves.