What really matters is your ability to execute as a team. I was 24 when I started my last company with a co-fouder who was 31 at the time. We had completely different backgrounds, and polar views on the world, but we worked well together as a team. That's really all that matters.

Before my last company, I had been the youngest employee at every company I received a W2 from. Now I'm an old man at the age of 30 realizing that none of the engineers I've sat down with for dnsworks would have any recollection of the Challenger Explosion or the wall falling. Merely a sobering side note.