I think I mostly read ages relatively. Both in comparison to LI and in comparison to me.
For SLBP!MC, I mostly read her as younger than me -- so late teens, early twenties? She's old enough to be an adult, but still young enough that the route's events are the first Big Thing to happen to her after adulthood. Shingen's is an exception, because she's just so strong-willed -- I read her as older than me.
There are some more hints in the other routes. She does need to be able to pass as a teenage boy in a few routes (Masamune's, for instance, where she ends up as a page boy).
Saizo's route gives us a range, though I forget the specifics. We know he and the MC met nine years ago, when she was a girl. She was old enough to make him some dango on her own and bring it to him and then to remember it for nine years and have it be a formative experience... So, early to mid twenties?
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For SLBP!MC, I mostly read her as younger than me -- so late teens, early twenties? She's old enough to be an adult, but still young enough that the route's events are the first Big Thing to happen to her after adulthood. Shingen's is an exception, because she's just so strong-willed -- I read her as older than me.
There are some more hints in the other routes. She does need to be able to pass as a teenage boy in a few routes (Masamune's, for instance, where she ends up as a page boy).
Saizo's route gives us a range, though I forget the specifics. We know he and the MC met nine years ago, when she was a girl. She was old enough to make him some dango on her own and bring it to him and then to remember it for nine years and have it be a formative experience... So, early to mid twenties?