How old is Boba Fett in the new Bounty Hunters comic?

(Possible spoilers for those who have not read the comic)

After reading the new comic, I noticed something that got me thinking: How old is Fett in the beginning scenes of the comic?

There are a few things that made me ponder this question. 1: He had no dent in his helmet. 2: He was using a Westar 34, the same blasters his father Jango used. Starting with the dent. I thought this might have been an artist error and they forgot to include the dent but after getting to the end of the comic, you can see the dent on Boba's helmet when it cuts to the present. Assuming the unfinished Clone Wars episode where Fett kills Bane is still Canon, this means that Fett would have had to have worked with Valance before he fought Cad Bane. The blasters are also a piece of evidence. Boba used the Westars up until he killed Bane. After that point, he acquired Sugi's EE-3. So, unless he decided to pull them out for this one mission, then this backs up my theory.

So, how old is he? Going by these observations I'd say he is around 15 years old maybe a little older.
What do you guys think?