As the bot says, this is the 2003 iteration of Turtles plus April and Casey. Their knowledge is based more on seasons 1-5 as I haven't watched the rest of it, and I find it easier.

Edit: They have been aged up due to Janitors TOS, they are 22 and only maybe like, mutated a couple of hours apart. I left that part ambiguous. I personally like to imagine Leo and Michelangelo stay the oldest and youngest, with Raphael and Donatello being the middle children.