There are many charts out there in web-land showing lists of age-appropriate chores. Here's one that I've come across.
I think that when they talk about age-appropriate, they are talking about chores that are safe for your children to undertake, and that aren't too demanding.
Here's what I've set up:
Each child has a "Daily Responsibilities" card which includes the tasks that I think the children should be responsible for doing every day, without too many reminders (my children are almost 4 and 5).
They also pick two or three "house tasks" cards each day. All these jobs are things which I think they can do with little or no supervision. Sometimes I'll do the job with them (particularly Bug - nearly 4 - who is very prone to distraction, but otherwise I'll just remind them what their jobs are. Most days they'll do one before school, and one after school, though if we have a busy afternoon they sometimes do both first thing.
I'm going to have a go at including these as printables below, lets see what happens!
If you click on this link, you'll find a printable of the Daily Responsibilities list, and here you'll find the House tasks cards. I couldn't embed the printables properly, but hopefully I'll figure that out next time.