I recently read a book about the design of the LIM. It amazes me how young many of the people were. The guy in charge of the LIM design, IIRC, was late 20’s. Just a little older than the guy in this article.
In 1962 when Grumman was awarded the contract for the Lunar Excursion Module (LEM), Thomas Kelly was promoted to be the lead engineer. He was 32 or 33.
He was 40 when Apollo 11 landed on the moon.
There's an episode of "From the Earth to the Moon" called "Spider" that focuses on Thomas Kelly. Highly recommended.
NASA wasn't a startup. It was (and is) a full blown government bureaucracy. The idea that there'd be a bunch of 20 and 30-somethings making critical decisions for a big organization like that is very foreign today.
The NASA bureaucrats were used to 20-to-30 somethings making critical decisions during WW2 and Korea. There was much less of a culture of delayed adulthood as we have today.
There's a bunch of "preliminary" apollo drawings at https://apollopreliminarydrawings.com/ They show the apollo command module designs that North American Aviation came up with before they were approved for a contract.