I saw Vinod Khosla @StartupGrind and he had this to say about junior people on teams (I am paraphrasing a lot): You want to have a balanced team of experienced

I saw Vinod Khosla @StartupGrind and he had this to say about junior people on teams (I am paraphrasing a lot): You want to have a balanced team of experienced people and junior people. This creates a team that is willing to try new "risky" ideas and at the same time allow for insight from experience. Age should not be a factor in seniority. He also noted that, unfortunately, we usually hire in our own image.