#hubert marks

The numbers I'm using:

From 10x15 Hades Hath No Fury: "You've been living here for 5 years and you haven't looked for me?" "Mrs. Young had died. I didn't know where to start."

From 12x07 Brother's Keeper: "But [Nigel Baker] still lost four years of his life."

Also from 12x07 Brother's Keeper: "The victim was this man. Daniel Marks, 20 years old."

I'm also going by the assumption that every season spans about a year which, based on the clues we've had as to what year it is throughout the series, seems fairly accurate.

Season 12 - Season 10 = 2 seasons = 2 years

4 years in season 12 - 2 years/seasons = 2 years since Daniel's murder in season 10

5 years - 2 years = 3 years between Mrs. Young having died and Daniel's murder

20 years old - 3 years = 17 years old when Mrs. Young had died