DS, now 8, gets 50c/year of age. So he gets €4 a week. Half goes into his bank account to save, and the other half goes onto his pre-pay debit card. It is dependent on leaving the house on time in the morning, having made his bed and brushed his teeth without a fuss. He gets 50c less each time this doesn't happen. He usually gets it all, but it can go down to €3 a week.
It's been useful in that I'm not late for work, and he is more appreciative of how much he has and what he wants to spend it on. The plan is to add an additional task each year. Maybe washing up once a week, or feeding the cat. Not sure yet!