assuming their age was fixed on the game's release date, everyone except Lilia, Malleus, Cater, Azul and Sebek, would have turned a year older the moment their birthday SSRs were released
interesting 👀✨
tho I personally kind of headcanoned all the boys to be a year older according to when the game was released— like if the boys had celebrated their birthdays beyond 03/18/20, I'd assume those who celebrated it after the date turned a year older during 2020 👀