To take a job working with year 9s

[Surelyitstimenow]

For secondary school teachers out there and parents of year 9s.
I'm interested in applying for a job working with year 9s to support teaching staff in the classroom. Some of it will be supporting behaviour management.
By this age, have the kids settled down in their behaviour and are more grown up and mature? Will they be a calm, well developed age group to work with?
I get that year 7 and even year 8 they are still young, but by year 9 has the immature behaviour all stopped? Has all the chattering in class, physical horseplay, silly behaviour and chat back stopped by the time they hey to year 9?
I'm thinking about the behaviour of year 9 boys more specifically, based on the assumption that girls have generally matured in their behaviour at a younger age than boys (stereotype I know)!

I totally agree.

With the greatest of respect I'm not sure how you'd be qualified to support the teacher with the behaviour if you have no idea about teenagers.

They are 13 and 14. Of course they haven't matured. Y9 is often the worst year.

Ok, thank you for all your replies.
I feel a very clear picture has been painted and I appreciate the actual specific examples of behaviour given, as this has helped clarify things for me more than people simply saying 'It's the worst year'.
Maybe I shan't pursue it then. It's a shame though. I like teenagers. I like their enthusiasm and energy, and I like to engage with young people.
No experience of actually working with this age group though.
I'm retired (early retirement, public sector), and fancied a job working with youngsters and this one appealed to me.
But examples provided here have made for an eyebrow raising read.

Year 9's are the worst for behaviour, obnoxiousness and unpleasantness by a significant margin! Run for the hills!

A school actually employing someone to manage behaviour is likely to have significant behavioural issues to manage. There's no money to employ someone for the fun of it.

Sorry, forgot to write <lighthearted>

@Surelyitstimenow why don't you apply, you could get it, see how you get on.
Schools are all very different - I still think it'd be a tough job, but who knows if it's for you or not ?
( is it an agency or applying directly to the school?)

I've taught for more than 30 years and I love Y9, mostly because I enjoy the topics I do with this year. I am the only one in the school who does, but I quite like a gobby 14 year old. They make me laugh (though not often in front of them)

However, you have to be prepared for the fact that, as many others have said, this is a notoriously difficult year group to deal with. They aren't mature. The boys still find willies and poo hilarious, or farting in front of you. If we are going to generalise then the girls are 'mean' and divide into cliques who are appalling to anyone who isn't one of them, doesn't meet their beauty/fashion standards, is a 'geek' or a 'swot'. Snapchat bullying is at its worst. Anorexia and self harm is always a worry. Lots and lots of mental health anxieties and drama.

Boys jeer and punch at each other, but can be surprisingly sweet to old ladies (me) at times. I can remember one saying to me earnestly (I'm 60) "I'm sorry I punched him in front of you, Miss but he's just a cunt" and genuinely meaning this as an apology. In addition you can be really firm with a teenage boy and come down on them like a ton of bricks and then tend to grin and think, 'Huh, I got caught!'. They will cheerfully shout 'Awright Miss?' when they see you in a corridor later in the day, having forgotten all about the fact that you have issued them a detention. Girls on the other hand will remember it and give you the evil eye forever...

I'm generalising obviously, but this is pretty common. I still like Y9, but I've been dealing with them for a long, long time and have no concerns about my behaviour management skills.