>>531121457
consult the chart

>>530195482
This is a high school girl simulator, every girl is roughly between the ages of 15 and 18. During your final year of high school you are 18, but you're still a child until you graduate.

>>527561529
Everyone in the game is between 15 and 18 years old. Its a society created by children, that only has children and no adults.

If a character looks like a loli she's probably 17 years old
If a character has giant breasts they're probably 15 years old

Blue Archive is like an anime version of Codename Kids next Door, except with sensei as the one adult in this world sent to this world to guide them.