Glad to meet someone else with this problem. People would talk to me as if I was not old enough to be taken seriously, even though I had been working professionally in the field since my 18th birthday. One time, I was told that I should be at the company for at least 6 months before offering an opinion. It's understandable when someone is just inexperienced, but by rendering a judgment on someone's expertise based on perceived age, I can't help but call it reverse ageism.

Now closing in on 50 with my share of life experience (good and bad) and some gray hairs setting in, it has gotten better, although people often mistake me for being 10-15 years younger than I actually am.