It’s no secret that bars is a tough event for any age, let alone for an adult. We just don’t spend that much time walking around on our hands as we do our legs, so the upper body and core tend to be the limitors. That said, it’s 100% possible to become better on bars as an adult than you were as a kid (it happened for me in my 30s). Check out these resources on improving on bars as an adult. See them now.
Adult Gymnastics 