Hi, I have two children ages 6 & 4. They've been "helping" me since they were able to walk. For the past couple of years, they have been able to be really helpful. Before age 4, they bring me laundry and help sort, and pretend to help fold. At 4 they learn to fold, match socks, sort, load/transfer from the washer to the dryer (we have front load), and start the dryer. I always take out the items that can't be dried, before they begin. When the washer is ready, I do the soap and start it.
I once read an article written by a wise mom who said, "It's our job to train our children) ourselves right out of a job...then we become Queen of our castle and the children become more able as adults to train their children."
So with all tasks from when they can walk...they are in training. And, training here is fun...not a job. They still don't know they have chores....:). We just all pitch in to help get the jobs done so we can have fun.