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Just read older books until there aren’t any and then move onto newer ones. There are too many that are a couple decades old for you to ever run out.

Also occasionally break the rule for a book you want to read. It isn’t like that would kill you.

The idea behind reading older books is that they're already proven to be useful - it's a filter for you to spend less time on useless information. It's generally called the "Lindy effect"

Love this question. I could imagine him suggesting reading academic papers for cutting edge things; like his 'barbell' excercise strategy of mostly walking with occasional HIITs.