In the workplace.
I'm going for a new role and I really want it. Another candidate is over 20 years older than me. I know the other candidate, I know I am at least as capable. But I worry that I lack gravitas/credibility until people get to know me and realise that actually I am very knowledgable and good at my job. I think this is taken more as a given with older and (people assume) more experienced employees.
I'm small in height, blonde, young-ish looking and I don't think these things help but I could be wrong.
How can I convey a bit of an air of "I'm good, take me seriously" at an interview, and more generally at work?