hi, this is probably a dumb question but wasn't meenah's ghost 19 and vriska's ghost 13? the whole thing kind of creeped me out :-(

Vriska’s ghost had been in the dreambubbles for a long time so while her ghost may look 13 since that’s when she died she’s actually a lot older because time works differently in the dreambubbles.  Meenah’s ghost on the other hand only recently arrived in the dreambubbles so she’s still relatively the same age.