You can and it's nothing like Lona...
->
https://f95zone.to/threads/i-shi-i-violated-princess-a-vh-game-spin-off.91775/
Sure that Violated Princess also have loli... but Violated Princess is even younger than Lona
There is one scene where girl... I don't remember her name but she starts her period.
That usualy starts at age of 10-12 - so VP must be between 9 and 12 ( and tbh. she looks like 8 xD )
But gameplay is a lot worse than in Lona, You don't have sandbox and all You can do is just pointless quests with milions of dialogue lines, some scenes are cool but LonaRPG is Sandbox where You can do anything You want, VP is just a story about dumb c* who gets raped by humans, orcs and goblins.
Sadly I can't recommend anything that have as good Sandbox as LonaRPG.
If You are looking for Sandbox Hentai RPG... LonaRPG is only good option in my opinion...
//Edit:
I mean... Period can start at age of even 6, there are some cases of it ( and it's super bad luck for girl )
But It's even more rare to start at age of 14 or after, so just by that scene You can guess VP character age