To counteract some of the points about teenagers.
Ours are not allowed to just eat the dinner food as a snack, or the packaged lunchbox type snacks. We buy a lot of bread, porridge oats, apples and eggs. Also own brand biscuits. These are snacks. They would never dream of eating their way through a pan of bolognese and would wait to check with me before serving themselves dinner.
They get an allowance that they have to use for trips out with friends etc, they also buy birthday presents for friends out of it but these are increasingly rare and usually only token gifts. This is not a particularly generous allowance, they get an extra £5 ‘holiday money’ in school holidays (£10 in summer holiday). They can also earn more by doing jobs around the house. Occasionally we’ll give them a little bit extra to do something specific with friends but this is only 3/4 times a year maximum not a monthly occurrence.
We have sim only contracts on a family plan that cost £35 in total for all 5 phones: The main phone is £15/month and extras 5/month. We set an amount (think it was £150 last time) that we’re prepared to pay for a phone and they have to pay any above that. DS asked for money for his birthday so he could put that towards one. We don’t upgrade phones every year or two.
Clubs are expensive yes, but boots, kits etc can often be bought unworn or barely worn second hand. I don’t think I’ve ever bought my son brand new football boots but he’s often had ones that have never been worn and the ones that have have been worn so little you can barely tell.
For clothes I buy the clothes they need, extras they buy themselves. My son likes branded everything but luckily he doesn’t mind if it comes from sports direct rather than JD. I also get a lot from vinted and ebay again either brand new or barely worn. My son doesn’t mind because he understands that that way he gets more for the money I’m prepared to spend. He wanted a north face coat, I said ok I’d spend up to £40 on a coat so he looked on vinted and found the exact one he wanted for £35 and bargained with me to get to keep the extra £5. If he’d insisted on it new he’d have had to save up to pay the difference. My daughter is more into the process of shopping than the actual clothes so I can’t really buy second hand for her now but again I give her limits and she has to pay the difference.
They haven’t had any school trips since before covid, they weren’t huge money though. Duke of Edinburgh was expensive (but optional).
Holidays and days out are expensive, we don’t do them often and mostly go camping now (one teen still comes, the other doesn’t).
They definitely cost more than my primary aged child but I don’t recognise some of the figures quoted on here.