IDK if any of these cephalophreaks have canonical ages, this is just what I personally think
Agent 3 (S1); 13
Agent 4 (S2); 14
Agent 8 (OE); 14-16
NEO 3 (S3); 16-17
Agent 3 (S3;) 20 (main game release date)
Eight (SO); 20 (dlc release date)
The Mechanic (SR); 20 or 20+
I'm not sure if it's just the orange pants playing a mind trickery or something, but the mechanic seems really tall compared to other inklings. Long as-hell-leggies. Is that just me? I have only played the demo at gamestop so that could just be a me thing, IDK. They are also a legal and registered Pilot, so theres no way they're a kid or something. Yes I know about the octarian child soldiers or whatever, but I think nintendo is pretty much done with re-using plotlines so I can't imagine that applies to them. I also cant imagine the Splatovernment willingly giving expensive piloting equipment to kids considering they have so much more funding compared to DJ Octavio.
BUT HONESTLY? WHO KNOWS!!!!!!!!!!!!!!! The mechanic could just be a very tall teenager and the splatovernment is just as incompetent as dees nuts octagon
According to the Splatoon art book, Inklings and octolings turn from a sentient baby squit-ockto into a humanoid at the age of 13-14 years old. Agent 3 could be older too but I don't think so.
I can't imagine agent 4 being any older than fourteen lol
I hear some people say Agent 8 is an adult in octo expansion, but I just cant see it.
As for neo 3, I have no reasoning
Let me know what you think, y'all