I never really felt like my age stopped people from wanting to work with me. I was speaking at conferences and lecturing at universities at 18, and I think that was mainly because web developing and management was a really young industry.
On April 1, 1998, I launched Webmaster-Resources.com, and I remember that date specifically because it was the date that the price of a two-year domain name registration dropped from $100 to $70, and considering I was funding this out of my allowance, that $30 made all the difference.