AN ATTEMPTED TIMELINE
JFC. Okay, so the DC writers do this thing where they just keep adding "one year later" into things and don't seem to think about the age of the character, so this is an attempted timeline with all the "one year later"s as well as the mess of how the Hush timeline interacts with the Lost Days (as I play Jason from post-Lost Days 6, pre-Hush). As is obvious, comics math is impossible, as Jason's supposed to be somewhere under 19 in Lost Days because in Cass's One Year Later arc (which is AFTER Under the Hood), Bruce mentions that they would be about the same age (and Cass is ~18-19). With all the CANON TIME JUMPS (in that they explicitly say how much time passes), he's 18 at the time of his "re-awakening" and departure from the al Ghul mansion.
Also, I know that Batman Annual 25 and Lost Days contradict each other in some pretty important ways, so this is my attempt to consolidate the two timelines into one.
His death: April 27th, 1985 (Death in the Family) - 15 years old
+.5 YEAR: Resurrection (15.5)
-6 months after his resurrection, Superboy Prime punches reality in the face (BA 25)
-walked twelve and a half miles to be discovered by a young couple (BA 25)
-took him to the hospital and the police began to investigate but they only had Bruce's first name as any kind of starting point (they didn't even have Jason's name) (BA 25)
-Jason goes into a coma (BA 25)
+1.5 YEARS: Coma (16.5)
-Jason's in a coma for a year before suddenly waking up and simply walking out of the hospital (BA 25 + LD 1)
-Lives on the streets of Gotham with no memories, only instincts for 5-6 months (BA 25/LD1)
+2.0 YEARS: al Ghuls /Autism/Amnesia (17.0)
-Jason's attacked by a thug and on instinct he pwns the guy (BA 25)
-Witness gets into contact with some of the criminal underworld and Talia al Ghul gets wind of Jason's being alive (BA 25)
-Talia pays some big bucks to bring Jason to the al Ghul mansion (BA 25)
-Jason is well-fed, nourished, brought back to health (LD 1)
-He's back at peak physical condition, but is thought to be brain-dead (LD 1)
-BUTTTTTTTTT: When Talia tells him that Bruce misses him, he cries - meaning he has his memories (otherwise why would he be crying?) - this implies a brain-damage-induced autism
-Talia takes care of him for a year, R'as thinks he's useless, unthinking (LD1/BA 25)
+3.0 YEARS: Reawakening (18.0)
-Talia pushes Jason into the Lazarus Pit and "regains his memory" (BA 25 + LD 1)
-Talia tells him that he's unavenged and that he shouldn't seek out Batman (BA 25 + LD 2)
-Jason learns about his death and that Batman allowed the Joker to go free (BA 25 + LD 2)
-Jason ditches the laptop and clothing and etc because he knows it's bugged (LD 2)
-Visits Gotham, sets up gangs/Penguin to go after a high-powered weapon, plants a bomb on the Batmobile, doesn't blow it up (LD 2)
+3.5 YEARS: LOST DAYS #3 (18.5-19.0)
-1 month on long-range guns/sniper
-5 weeks (1ish month)
>GRAND TOTAL OF THE ABOVE: 90 Days/3 months (implying that there were other tutors)
-Trains under Egon for hand-to-hand combat/maiming for 3ish weeks
-Busts Egon's child-trafficking ring and kills him using bleach - his first kill (not counting Felipe Garzonas in Robin years, which is still a question)
+4.0-4.5 YEARS: LOST DAYS #4/5/beginning of 6 (19.0-19.5)
-lots more training has happened (mentions pilot training for a month under Rip, surveillance, close combat, and small firearms, but Talia says that half of his instructors have ended up dead)
-he's already killed a number of people
-TALIA SHOWS HIM ROBIN - He's upset.
-Jason thwarts the London bomb plot of the Ivgene Clan, promptly kills all of the Ivgene Clan that show up to his place after
-The one guy who he runs out of ammo on tells him the location of the Joker
-Jason gets leads to find the Joker's location, tortures, kills, and does what's needed to get the job done
+5.0 YEARS: Lost Days 6/Batman Annual 25/Batman 617-618/635 (20.0)
-Foils Joker's plot to set Gotham's water supply on fire, doesn't kill the Joker (LD 6)
-Has sex with Talia (LD 6) & R'as al Ghul's death
-Talia: "WayneTech purchases succeeding" (LD 6/BA 25)
-Meets up with Hush to discuss things (LD 6/BA25)
-Talia: "The acquisition of the Kord Corporation will be complete by "the end of the month" (LD 6) & the acquisition of the 'hood' and the knife (his hideout is depicted in an office area)
**JASON'S CURRENT TIME POINT IS PULLED FROM HERE**
-Jason seeks out Bruce in his graveyard, attacks Tim Drake, and when Bruce doesn't believe him, Jason flees halfway through the battle and Clayface replaces him (B 617-618, BA 25) - Also, white streak begins to show up.
-Cements his identity as the Red Hood (because "the father had lost a son, and now the son has lost the father. His own mortality had become the wedge between them. And his path was clear.") (BA 25) (his hideout is in an underground area, potentially a sewer or in an industrial area)
-Lucius: "As of ten hours ago, Kord was the target of a hostile takeover…. and they own it." (B 635). - Even though there's A LOT that was supposed to happen between Hush and Under the Hood. 6_9
SO. :|
The way time works in comics is super weird.