Well, as Zorlun pointed out, originally he had put certain ages, then changed them. Honestly, I did not change the ages in the incest patch, I will see to make sure to update them to follow his indication, when he updates them.OK, starting a new game with the incest patch to see how much difference there is in the game.
This throws a few questions about the game with the incest patch, but it's the introductions at the start of the game, I noticed neither Marc nor Katherine's ages are given, might not be seen as a problem in the non incest game, but with the incest patch, Myriam is meant to be 34 according to her introduction, with Anthony being 46, with all characters allegedly being over 18, that would mean Myriam had Katherine when she was 15 and Marc when she was 16 as Marc and Katherine aren't twins, so why isn't Anthony in jail for having sex with a minor as he is meant to be the father of both?
But it still means without the incest patch Myriam was at least 16 when Katherine was born if she is meant to be 18, maybe older.
Though about Anthony going to jail for having sex when Myriam was 15, nope, or at least, it depends.
Remember that Zorlun is French (well, it's not a secret), and in France, the age of consent is 15, unless there is form of coercion or the older person has a factual or legal authority or is an ascendant, so, he may not have calculated too much the age.
Some other countries have even 14 as age of consent, sometime with similar clauses. Notice also those clause are not a general "automatic statutory rape", it is a statutory rape, but based on conditions additional to the age difference, which in itself is not enough.
Some country that has that type of provision, in the past had directly statutory rape if one was 18 or above and the other not, but it is not anymore the case.
In USA, it varies from state to state, I remember California say it is 18, and it is illegal even if both are under 18 (though in that case is classified as a minor offence).
In some state the age of consent is 16, but if I do not remember wrong (had looke for curiosity, exactly for a conversation in this forum about the game), there should be at least one or two states that have 15 or 14 and without statutory rape, unless the older person has a formal authority over the younger one (including being a tutor or teacher).
Not considering "Romeo and Juliet" stuff, because we are talking about a much older man and a younger girl.