What's something that makes you feel old?

Seeing people much younger or my age in all these formal positions like doctors, nurses, optometrists, teachers, bank clerks... I'm used to talk to these aunties and old men being in the sort of position of authority, possesing the knowledge in their field. So yeah, this is pretty new to me and it makes me feel like I should also be able to at least pretend to be the professional in what I do. 😅