Anyone know how old Koriand'r is in Red Hood and the Outlaws? I'm guessing somewhere in her 20's

id say 20 or 21, Jason is supposedly only 19 or 20

for some odd reason i think shes in her thirtys

well depends on the time line of her planet but yea i agree i would not put her past 21 now.

She looks older tho :/ I think she's about 26+-

around Dick's age I suppose, 21/22

Several factors need to be taken into account here. Tamaranians age slower than Humans. Also a year on Tamaran is likely not the same as a year on Earth. So she could be 19 or 20 or she could be 100. I doubt she is 100. But she could easily be 30 or 35 earth Years old. But based on how she is portrayed in comics and movies. I would say she is in her mid to late 20's