That isn't common logic whatsoever.
Even if it was common logic you'd need to actually explain and exemplify your statement.
Yeah, doing soemthing different or in line with your dream job could be a form of maturing.
But what if you don't have that oppertunity?
What if you are stuck doing that job you did at 15 years old because you can't afford the educaton necesarry to do the job you'd ideally want?
What if you could afford it but you have people in your life who rely on you and therefore you have to sacrifice your chance to stay at the job you did at 15 in order to support them?
What if you have a physical or mental handicap which means you literally cannot do anything other than this one job you've been doing since you were 15?
What if you as a 15 year old maybe lucked out and it was your dream job?
What if you as a 15 year old lucked out and got a good job or a job somewhere that allowed you to climb the ladder in that same place?
I'm in my mid-20s. I have my dream job right now pretty much. I don't want to leave, I'd happily stay there forever. Is this immaturity?
By virtue of all these examples, by virute in fact of you yourself admitting that changing your job from when you were 15 is not necesarilly a form of maturing then 'common logic' would indicate that actually it has nothing to do with your job.
Maturing is a state of being, a state of mind, or life.
Hence you have...well Donald Trump for instance who is a 70+ year old billionaire with what is literally the most important job on Earth and he is catagorically mentally/emotionally immature.
He's changed jobs.
He's got what is for many people a dream job.
But it doesn't matter.
Why?
Because one's occupation is entirely unrelated to one's state of maturity.
You could be 50 years old stacking shelves and be a mature person.
You can be 15 years old serving food at McDonalds but be mature for your age, saving that money for college or supporting your sick mother.
You could be over 70 years old and President of the most powerful nation on Earth and be a man-child nevertheless.
Danny Rand wasn't an everyman at all, he was a Kung Fu dude who grew up in a mystical monestary.
a) he is a true everyman
b) he isn't emotionally crippled, he doesn't live an eternal teenage.college soap opera, you just misinterpeted the text
c) That is a cynical interpretation in the first place
d) Read JMS and JMD's runs of Spider-Man where he's an adult. Hell read the MIchelinie run even. Most of that is Spider-Man as a mature adult albeit one who makes mistakes
e) Spider-Man lived in the suburbs until he was 19 years old. Then he lived in an off campus apartment for a year or three with a rich kid then he lived in a crappy Chelsea apartment in his early-mid 20s. The Hell could he be an inner city youth let alone adopt that mindset?