Mine is 4 and can do easy things like bread dough (if I put the ingredients out and tell her how much of what to put in, then help with the mixing and kneading as required, as she can't really properly knead a large loaf for the family), cake (just have to put up with the odd egg going on the floor), chop softer veg and fruit with a butter knife, put stuff in pots or trays, use mixer to whip egg whites, grate cheese, peel carrots if we do it together and I have a hold on the peeler. I let her stir the pot if I'm right there watching. I don't let her near the oven or anything that might spit on the hob. She is desperate to use a proper knife, but I'm not keen on risking having to talk about in in A&E so I only let her do that if we are using it together and I'm holding the knife, too. She'd also love to season a whole raw chicken, but I can't bear the thought yet (as she tends to put her hands in her mouth a lot).