If you are articulate and confident with people in your role. This should be enough.

Today at the checkout the assistant appeared not to want to ring my wine through until I established eyecontact with her (helping her to determine my age I guess). People do assume I am young, a patient once told me I was one of those people who would always be childlike.

As long as I can get what I want from situations I don't tend to worry too much.