I had an interview for a job where I had 2 years extra experience than they were asking for and a higher level qualification than what they asked. The feedback was that I seem very intelligent, capable, with great experience and well spoken, but they decided I am too junior for that role.
Additionally, the reason I am looking for work at the moment is because my role at my last company was made redundant. At the time they were advertising for a new role which I had a lot of the experience for, and with 3 years of experience with their specific technology from already working there. I was told that I couldn't be moved into the new role because they were looking for someone more senior. I later found out they hired a guy who is my age and with the same amount of work experience (but in a different industry), who graduated a couple of years later than I did.
I am a female in my mid twenties and I am quite young looking, I think my voice sounds younger than I am as well, but I can speak well. I can't help but think this is why I might be perceived as too junior. Are there any strategies I can use to be perceived as more mature?