My kids have had pocket money from a young age - at first a few pounds a month, mainly to stop the (what sometimes felt like!) constant requests for stuff, lol! Much nicer to go out somewhere and know I wasn't going to end up in the gift shop being badgered for tat
I have never linked it to jobs or anything else - they are just expected to help out.
At 7 they could open an account in their own name at my building society, so then we did that. From that age I would give them £20/month - £4 in fact they never see as it goes to sponsor an animal (dogs, dolphins, tigers, polar bears
), £10 would be transferred straight into their account so they would have to think and plan to take it out, and I'd give them £6 in cash.
As they got a bit older and started actually spending a bit more money on themselves, I upped it to £25 at 11, and then £60 at 13, and just transfer it all (minus £4 animal sponsorship DD that goes from my account) to their bank accounts. The teenagers buy nearly all their non-school clothes, their own toiletries, their own phone credit, pay for their own entertainment, etc. I pay for school stuff, drama group and other weekly things, and anything I feel like buying them
I pay for one's school bus pass, and so she has free bus transport at weekends, so I'll give the other one bus fare if she wants it! But she usually cycles everywhere (including to school), so I pay for her bike upkeep, helmet, lock, etc. They also use their own money for birthday and Christmas presents.
It seems to work for us - they don't complain of not having enough money, although I sometimes complain that dd1 has spent too much money on books and could do with some new jeans, lol.