Earlier quoted context omitted.
Ageism isn't a very compelling basis for an argument.
I can see how this can be seen as bad. Just, I don't think he is familiar with underlying technology and that is why he can't see how this will work. In a way this is ageism and I accept your criticism. But I still don't think he is right and understand this correctly.
I appreciate not knee-jerk reacting to the criticism, but you didn't really accept it, you deflected it.
Again, you're making the argument that he doesn't understand Bitcoin well enough to have a valid opinion about it, and the basis of that argument is his age.
If you have evidence of things he's said or done that demonstrate a misunderstanding of the technology, that's fair game. What's not fair game is saying, "he can't possibly understand it because he's old".