Exactly! Starting a company requires a lot of maturity, a tangible vision, and a bit of wild streak, and you build a healthy mix of all 3 after working in a domain for a decent amount of time. The most successful founders I've seen are those who tended to start their companies in their mid-30s after a decent mix of Engineering, Sales, and PM experience from the IC to leadership level, but after their kids (if they chose to have them) are already in grade school.