Generally, marriage is mostly no longer a requirement for family and kids. But at the same time, divorce seems to still hold a lot of stigma.
Some examples about different aspects you might want to ellaborate on:
If a younger couple gets divorced after a short time of getting married, how do people react? If older people in their ~70s get divorced, how do people react? Do you need a specific reason to get divorced (legally or socially, e.g "not happy" is not enough of a reason) and if so, what kind of reasons are acceptable?