The furthering chapters and this have spoilers for Justice League Dark Apokolips.
The Plotline is based on this movie with some tiny edits since adding in Val/Adora/Red Angel.
Many characters in this movie had died, due to the movie plotline.

Ages when the movie takes place:
Raven/Rachel is 20
Gar/Beastboy (is alive in this one) is 20
Damian/Robin is 19
Val is 19
Superboy/ Jon is 18
Constantine is unkown
As well as Superman's

Also for those who are reading this in 2020, I changed Adora's backstory in DC Hierarchy, so if you want to check that out.