It honestly depends on their personalities, how responsible they are and how much you trust them - bear in mind my mum and dad trusted
me and my sister implicitly when they did the same and we still threw a party!
It’s not always the oldest who is the likeliest to be guilty of this either.
My parents went away when my sister was 16 and I was 19. I worked on the same street and did a 4 hour shift thinking she was chilling at home and came back at 8pm to a houseful.
To be fair we tidied the house till it was spotless and made smokers go outside and use plates for ash trays so there weren’t fag ends everywhere outside. We hoovered, dusted, deep cleaned the whole kitchen and even took recycling and rubbish to the tip to hide evidence, we would have completely got away with it if the neighbour hadn’t grassed on us, we denied it but left the ash tray plate in the dishwasher and forgot to turn it on 😂. We also took photos which were then used as evidence against us.
Are your kids housetrained? I’d actually moved out at 18 and stayed at my mum and dad’s to look after my sister. We were completely self sufficient and apart from the party looked after the house and ourselves perfectly well.
Do they get on with each other and would they all behave or would one encourage the others to have a party like my sister did?
It you think they could all look after themselves without being at each others throats then the eldest should be old enough to look after the others, they are old enough to live alone.
If they can’t boil an egg or would go out and leave the house unlocked or do nothing but argue then you will just worry the whole time. If that’s the case then you might need to work on them developing more domestic skills and being more responsible!