It's a way to divide up the masses & debilitate millennials.
Our rulers ( doesn't really matter which country )
Maintain power by keeping us complacent & distracted.
They do this in many ways, comfort & social conformity etc.
They've lowered the quality of our education
& Reduced entry requirements because now universities are more about indoctrination than education.
They push drugs & sex through mainstream TV & music.
They seek to promote "multiculturalism" knowing that there will be natural division between different groups + Agitate those differences. They are always trying to divide us. They push subcultures which promotes unachievable standards & unhealthy vices. This keeps us chasing materialism, creates unhealthy competition, makes us narcissistic & depressed. When you're self centered you're easy to control (divide & conquer) & when you're depressed & insecure, you're more likely to be compliant & consume to fill the void.
We lose what we should be trying to achieve -
((Living for a higher purpose))
((Working to help our people//communities))
((Starting happy families))
Lastly to answer your questions
They divide the age groups & class groups
Rich Vs poor // Young Vs old
Politics (which in democracy is a joke,
it's essentially theatre Left Vs Right)
So that our attention & energy is always redirected away from the ruling elite (government, banks & big multinational corporations). We judge and fight amongst ourselves instead of wanting better from the people who rule us. For the last few 100 years, the elite have been slowly improving their methods of manipulation.
TV for example, are called programmes
(Because they're programming your mind)
It's essentially Psychological Warfare
Being conducted on a global level.
Hollywood isn't there to entertain you
It's there to control you.
Apologies for the long wall of text
But there is your answer ^_<