i always throw around 3-ish years as the average age a queen has their first litter in my head based kinda entirely on when like, bluestar and sandstorm had their litters, but i feel like that’s probably wrong?
in the first arcs (i’m talking like, tnp and po3; tpb is a whole different ballgame), i remember the majority of queens being like, super young. ferncloud, nightcloud, and leafpool/squirrelfight were all about a year and a half? brightheart was two-ish. but you also got sorreltail, who was about four.
as the arcs go on, i feel like queens get older when they have their first litters? tawnypelt and cinderheart are about four. dovewing, ivypool, and heathertail are about five. but you also got queens like lilyheart, who was about one and half when she had her kits.
for backfilled/retconned queens and litters you get wildly different ages like ashheart who didn’t have her first litter until eight years old but also dawncloud who had her litter at less than a year.