At The Millions, Sonya Chung provides a variation to The Rule of Fifty with The 25-page Test
Standard trial run. I bought the book on impulse; it’s been lying around for a while. I pick it up and start reading. Am I eager to read page 26 (even better: did page 26 come and go without my noticing)? Am I stopping to scribble in my notebook because the book is sparking responses that matter enough to write down? Or — have two paragraphs gone by and I don’t know what I just read (in which case something is evidently not clicking).
She mostly leaves age out of her consideration, but she acknowledges it
As we get older — as the nature of our work and passions specifies, as our aesthetic palates grow more particular — we understand that, given the sheer number of artful and compelling books in the world relative to the time we have on the planet, “good” is more contextual than absolute. Deciding what to read next is thus as much about Knowing Thyself as Knowing Literature. School attempts to teach the latter; it’s the self-knowledge that we must develop on our own, over time.
She provides nine other tests besides.