Guessing you maybe work in the consulting industry?

The "seniors" tend to be glorified salespeople whose job is to put together presentations and reassure clients that everything's going well, while the one or more interns/recent grads do all the technical work. Some projects there'd be one junior literally writing every line of code while the seniors spent their entire time in meeting rooms talking about god knows what.

Dressing smart, talking smoothly, and being older looking (to imply experience to clients) are the attributes that get you a senior role.