I agree. Being a few years older than mark, I actually didn't find myself offended by his comments.

Just as PG said that adulthood is a stage, not an age, I took mark's comments (though quite less elegant), to mean that there's a mindset of youth that helps in starting companies: simple life, willingness to take risks, lack of corruption of the complacency of the workplace, etc.

Maybe I give him too much credit.