I don't think that young founder-driven companies make sense in biotech. Young founders do well in tech because business model innovation requires contrarian thinking, which young people (who are naive and lack preconceptions) are more likely to do. Also, software engineering can be learned at home for very little money, on one's own, even at a very early age.

In biotech, once the technology has been developed, the innovative component has largely been completed. And it's the top scientists that have the institutional knowledge and non-dilutive funding to make that happen. The reason there are so many unmet needs in healthcare isn't for lack of trying or a lack of original thought in the top academic research labs - you can be sure that Bob Langer isn't just trying to up his h-index.

That said, you are right that a recent graduate won't be able to found a company in that model. That's mostly irrelevant though, since recent graduates are rarely capable of creating scientific breakthroughs on their own.