Some of them are very funny, because they're a little simplistic since they didn't track character personalities / stories really well for art development.
"Was in shock after he found the Skull Merchant" like okay
Every age of original Survivors in Dead by Daylight, a few guesses here and there but *most* are carefully researched and / or sourced through official means.
And again, YES. I can 100% confirm Lee Yun-jin is in her early fifties.