Honestly, I would say that the olds, like us, aren't the target market. Learning how to run a game by reading a book was never the preferred method (most people learned by playing with others back then, and then branching off), but today, most people learn by watching youtube and twitch streams.
Or, for that matter, going to the website-
Ready to begin playing Dungeons & Dragons? Let's get you started!
dnd.wizards.com
Ready to try your hand at becoming the Dungeon Master? Let's get you started!
dnd.wizards.com
And if you want more, the website, after videos, guides you to...
First, the starter set.
Then, the essentials kit.
Finally, the core rulebooks.