Absolute nonsense.

I am over 40 years old, and I have been involved in bitcoin for nearly 6 years now.

My sister is more than 40 years old and she has owned and used bitcoin for more than 4 years now.

I have a co-worker that is more than 40 years old and, prior to working at this company with me, he worked for a company that paid his salary with bitcoin.

My father is more than 60 years old and he has owned and used bitcoin for more than 4 years now.

I don't personally know ANYBODY less than 30 years old that has any bitcoins at all, or that is involved in any way with bitcoin.