Fate/Samurai Remnant: Bailong and the Crimson Demon (2) Strategy Meeting [Nebulous Adventures] 

25:22 There's a lot of weirdness with character ages in this game. Iori should be 38-39, and Tsuchimikado Yasuhiro should be 39-40. Do they look like they have a one year difference? Takao Dayu (if she's the second one) should be 10-11. Dorothea is fictional, but her father isn't. And he's 35-36. Must have married much younger here than he did in history. Zheng Chenggong at least looks plausible for his 26-27. Tsuchimikado Takatoshi also seems fittingly young for his supposed 24-25. Chiemon is completely fictional, so there is nothing to really contradict. He was a kid during Shimabara Rebellion, and the higher side of that, as far as I can tell from the flashbacks, so... 10-13 back then, 24-28 during the game... with some wiggle room. And Yui Shousetsu has the in-universe excuse to not look her age, that is being a homunculus... so the writers went out of their way to establish in dialogue, what her presumed age in this setting is. Dorothea in one scene muses that by all accounts, Yui should be over 30. Historical Yui Shousetsu would be 45-46. Still, whichever account we go by, it is reasonable that Zheng would expect Yui to be older than him.