The venture business is a bit of an apprenticeship business, so the firm I worked for didn't let me make an investment until I was 30. That was probably a very smart thing.
Internet and mobile product development cycles are measured in months, not years. And the capital required to get a product built and into the market is less than $1 million. And the returns, when things work out, can be enormous.
The best talent in the venture industry doesn't work in large companies and won't work in large companies.