Sometimes this is logical, other times it seems like an attention grab. It is fairly common for certain communities on, for example, Livejournal to be overly sensitive to people's 'triggers' (often but not always relating to sexual assault)--any mention of violence may be censored.
Why having kids later is a really big deal. The average age of American women having their first child reached a record high of 26 years old in 2013, according to the Centers for Disease Control and Prevention's National Vital Statistics Report.
Generation has many meanings, with different values. None of them are exact. 27 - 35 for The average age in my family between parents and children. That is, if the parents were the same age and had children at age 24, 28, 30 and 32, the generation for them would be 29 years.