I have 3 teenagers, they are 13 (boy) 14.5 (girl) and 15.5 (girl) I shall mostly be talking about:
Food - how much do they sodding eat?
The fact that they are sullen introverted beasts whenever you want to go somewhere or do something - but as SOON as you sit down to watch something that YOU would like to see on YOUR tv they rock up and witter at you nonstop about various fascinating topics ( "Have you heard about X who's got this amazing youtube channel, it's hilarious..." "You know my friends neighbours aunts cousins daughter, well she....." "I made this awesome axe on minecraft....")
The constant sneering derision about my life/clothes/interests but if my stuff isn't nailed down it gets 'borrowed'.
The many and varied prima donna moments over the most trivial of things " Where are the black tights, I HATE you, you're controlling and you've got me under house arrest..."
Their pits aka bedrooms aka health hazards
The fact that if I need a charger for something or my headphones they have been appropriated
And finally, that unlike toddlers they are in your face until nearly bloody midnight!!
And with 3 of them there is a non stop caravan of hormones, drama, requests for cash, hormones, tantrums, hormones.
I think that's about it for now.