There are events that define a human being. Some events can be personal like graduation, marriage, retirement, meeting your idol while some events can be of larger scale like national events.
For earlier generations, some larger events were during the world wars, independence days, Armstrong walking on the moon etc. While our generation and next will have to live through loss of glaciers, animals and plants. We already have Aug 2019 when the first glacier was lost. In 2018, the Spix's Macaw (famous for its appearance in movie "Rio") went extinct in the wild.
Steadily (and sadly, not slowly) we are moving to a time when we will see the last human generation itself.