There is a fine line between valid criticism of gender roles & sexism.

An example of the former would be, “Men are dangerous for women”. Of course not all men are dangerous, but it describes the experience of many women & how they have to navigate the world, to not be assaulted.

This one describes the dynamic of a relationship between individuals & assigns a thought pattern to one of those individuals, based on their gender.

Maybe I missed some nuances here & I would be glad to be enlightened, but this looks like plain sexism.

Well from personal experience I would argue that there are more than 2 points in life where you age dramatically, because never in my live I have been 44 or 60 years old, but still had at least one phase in live, where my body suddenly felt a lot older.