According to me mostly people that came in crypto are mostly young aged people that range from 15 to 30 years. And I have seen less old people that first gotten in crypto. Because they think that crypto is not good for them.
You have made your assumptions based on what you know and the very few insignificant number of persons you know who are in bitcoins compared to the total number of bitcoin hodlers worldwide.
Age is something of the body, it does not determine how accepting someone will be when introduced to crypto for the first time, what determines it is how accepting the persons mind is to new ideas and innovations, and this is not restricted to only people who are young in body and age. Some people who are old in body and age, but young and accepting at heart and mind have accepted bitcoins and are hodling, at the same time, you will find people who are young in body and age but not accepting at heart and mind still holding opinions that bitcoin is a scam.