boy is growing some hair

I just had a realization that YTWC's age hasn't been never addressed straight in YTWC's Black. While his current age is mentioned here, I'm pretty sure most of you still have no idea how old he's supposed to be...and I really can't blame you: YTWC's age has been mentioned/hinted only twice during the story:
-A flashback in YTWC's SoulSilver part 39 that takes place little before the story starts says he's almost sixteen
-In the prologue of YTWC's Black it is said Team Rocket incident in Goldenrod City happened three years ago

Now, more about the timeline in the story:
-YTWC is 15 when he first arrives to Johto to get his first Pokémon. He turns 16 some time before he goes to Kanto.
-His depression really starts kick in when he's 17. It gets worse when he's 18.
-YTWC is 19 in the beginning of YTWC's Black. Currently he's less than 6 months away from his 20th birthday.

Another thing I've wanted to address is that YTWC has curly hair. This really shows when he's 16, but once his hair gets longer it's harder to notice.