We give 50 cents per year of age. Yes, being older has perks, like more allowance and a later bedtime, but also more responsibilities and harder chores.
Assigned chores are a must. We call it "family work," because everyone in the family needs to contribute. They don't get paid for individual chores that are just what you are supposed to do like cleaning their rooms, doing their laundry, and self-care. Their family work is stuff that helps out the entire household system. Vacuuming, cleaning a bathroom, washing and drying dishes, caring for pets, raking leaves and mowing the grass, sweeping and mopping a floor, general cleaning of clutter and putting things away, taking out all the trash in the whole house, bringing the cans to the street on the night before trash day, et cetera.
Money is earned. And to earn it, work must be done. That's a necessary lesson for kids.
I know you'll likely get suggestions for charts and such to track chores. We don't use these. They're cumbersome and generally worthless. We have daily chores (clean up after dinner, dishes, general straightening, individual chores), and then we have weekly chores which are done on Saturday and must be complete before any access to games, screens or play. Each of the kids and adults has specific duties that, when all added up, result in a clean house. Don't be afraid to give over some of the stuff you've been doing to the kids. They need to know how to do that stuff too. :-)
ETA: We certainly do not just hand out money, nor do we allow anyone to shirk on helping. The money is both earned, and a tool to teach them how to handle money responsibly. There is often more work than just their regular chores to be done, and I agree with B, that work is not being paid-for. The boys also go mow lawns in the neighborhood and shovel drives and walkways when it snows. They earn good money that way, but we don't pay them to shovel our own (very long) drive. That's just a part of being family. We help one another.