Some of these trends will be obvious to the typical person, though many will not be.
I have no idea if these trends are truly global, or throughout the West, or if they will continue into the future (though I can make some educated guesses).
This is very interesting, since as the culture moves further to the political left, more and more Western countries and districts are actually the age of consent, because, according to all these left-wing over-33 women, 17 year-old women having voluntary sex with 25 year-old men (or older) is clearly evil and wrong and Must Be Stopped™.
Zhang Muyi, a Chinese pop singer and his girlfriend, Canadian child model Akama Miki, are the Justin Bieber and Selena Gomez of China.
That is an upbeat and optimistic approach to aging; however the question is if that applies when it comes to relationships.