Jeanne being ten doesn’t even make sense, though. (neither does Nichrom, but I’m less knowledgeable).
She can walk and she lived alone on the streets when we see the one past-clearing panel in the vol 26-ish. So she must have been at LEAST five (and even then…). Which, if we go by the 1990 date, means she has but five years to:
- grow attached to Marco and Luchist enough for a) be convinced she wants to become the Iron Maiden (6 months/1 year) b) stay with marco at all costs, (long time process, the full 5 years) c) Luc being sure she would be unable to face him even though he’s weaker (so Luchist himself who left in 1996 had but a year to grow reaaal close to her)
- go from A LITTLE furyoku to 500K points. which means about 100K a year, while at first she probably couldn’t stay long in the Maiden since it goddarn HURTS A LOT.
- grow from street urchin to very well mannered, crybaby-like princess (long time process, full 5 years and more) AND one who believes she’s a saint
- be so grown up as to accept whatever Marco throws at her (so she’d say ‘i already knew’ when he revealed that he’d lied).
Out of all these things, it’s the Luchist business that bothers me the most. They got her past toddler stage (so at least four/five) which is WAY TOO EARLY for a baby to accept to lock herself in a torture device. So if she were born in 1990 at least for six months they had to grow close to her, to tend to her probable issues (hunger, cold, brittle body, probably foul mouth and broken mind - luchist said something akin to 'no personality’ -) and convince her already to get into the Maiden, and to grow to trust and love those two men - all of this under a yEAR since Hao got Luchist in 1996.
So yeah, that’s why I go by the calendar I found I don’t exactly remember where, the Jj I will always speak of is born in 1988, she’s 11-13 in the 99-2001 timeline.