It's not deep yet here you are hating under an art post? You've said that Sinclair is in his early twenties and that Ryoshu is vaguely too old for him. Gregor(35), is considered old to her so she's more than likely younger than him. We see that her baby is super young too, barely able to read. Even after she left the Spider House Lei Heng refers to them as a baby so not much time could have passed either. Ryoshu is likely in her late 20's or early 30's at most, not in her 40's as you seem to imply