Meaningful categorization is a necessary and foundational aspect of science and understanding in general. We categorize matter into categories such a solid, liquid, and gas, because this has meaningful consequences beyond merely temperature.

If you think the categories in this article are useless, you're going to need to justify that. Aging is well-known to encompass phases with nonlinear transformations, such as puberty or menopause.

So what you find "annoying" is actually a building block of science. And while disagreeing in a particular case is certainly valid, you're going to have to either present evidence to the contrary, or else find weaknesses in the particular methodology used.

So there's plenty to engage with. But you're not doing it, so your comments are just snark with no value.