I found a few!
Confirmed details from Sera
Hello! You're seriously my favorite writer I love... - Seraphinite Games
^ UB from oldest to youngest
So actual ages are spoilers, but how old are UB (N... - Seraphinite Games
^ age of UB according to their driving license (spoiler being that some of these are the actual age of their turning)
Wait A is MUCH older than N? For some reason i... - Seraphinite Games
^ A is much older than N
Theories and hunches
The Wayhaven Chronicles: Book One (WIP) - #2512 by Hannah_Minger
^ N’s age
The Wayhaven Chronicles: Book One (Discussion) FAQ Located on Post 2 - #3794 by Hannah_Minger
^ F’s and M’s age
Still finding the elusive A…