Seconding the suggestions at an older teen. Perhaps get in touch with your local secondary school; parent groups to find a willing teenager, or perhaps try a nearby church or any youth groups? As you are in the house also you will be able to deal with potential lack of commitment etc, and observe interactions until you are happy. To make the job attractive I would have a selection of breakfast items that they can help themselves to when you are gone, so that they can carry on getting ready, do their hair etc when you’re gone. Two hours for £20, second hour they get to breakfast and get ready, hang a load of clothes out, unload dishwasher, wipe down surfaces, tidy baby room, that sort of thing. (I wouldn’t offer more than £10ph to a 17/18y old as they might be highly suspicious. But agree that you have to offer at least £20 to make it worth their while in turning up. You can always up the rate/reduce the time if you don’t get anywhere). Very easy money for them and makes life so much easier for you.
We live in a semi-rural area and tried to get some help for before and after school and entirely unable (had to change working hours in the end) however we don’t have a sixth form in the town, so couldn’t enlist teenagers. I do know older teens who I would trust. They just weren’t available as they were on the bus to their far away college!
When I was in sixth form a friend and I took it in turns to take three children aged 8, 10 and 12 from our neighbouring school, through London to their home and gave them a ready meal type dinner. We viewed it as extraordinarily easy money, and although I was useless at committing to most things at that age, I was completely committed to this job as the alternative was that the children were left alone so of course I was there. It also provided me with drinking money. We got around £5ph which we thought was a huge amount of money. My previous job was in a tea room at £2.50ph and McD’s paid around £4ph, all pre minimum wage; around 20 yes ago. We used to swap the days around if we were ill or had plans; if you can recruit a pair of friends this could work brilliantly as it gives them that flexibility. Job grew to doing a few days during the holidays also. Easy cash for us, big problem solver for the parents.
6am is not too early, and as a parent if my children were 17/18 I would be delighted for them to have this type of job. You’ll attract the sort who get up early for a run etc. and automatically weed out anyone useless as there’s no way they’d contemplate such an early start! Good luck!