Change's

part of life is that everyting change's for some reason.... as you age, your appearance change's... as you do stuff, your way of living change's... as you sleep/eat, your mood change's... the only thing that doesn't change is that things will keep changing... and in Let us Brave, this is being referenced...

Appearance of Aging
in Let us Brave Strangativicties, they start at the age of 14... they look simple and not yet like an open book of personalities... in episode 10, their appearance change's into everyone having their own style... in episode 11, they look different because it's a flashback from halloween 2015... in episode 12 & 13 their appearance fits the situation & event: "schooltrip/summer vacation"... and in season 2, they slowly change per episode... most notably teresa... for more information go to this page

Age in Seasons
in Let us Brave, there are no birthday episodes so it's unclear WHEN they age... that's why you just gotta look at their age together with the seasons... here are a few hints:

Let us Brave Strangativicties
in season 1, they're all 14... because the show is for 14+ and thus they're more relateable like this...

Let us Brave L50
in season 2, they're all 15... because the episodes timeline are in sync with ours, meaning they age per year... but this season is for 16+ so be aware...