Using the Presso is a bit like having a play with a new toy. The only thing different is that unlike typical new "plastic" toys, once they break you have to chuck them in the bin. Not the Presso: if you happen to break it or in time wear out one of the parts, you can easily repair it with replacement parts. Pictured below is Moe (9 years old) pulling a lovely shot for her Dad with their Presso (photo by Jon Sturge).
Please don't violate child labour laws and if you are going to teach your children how to use the Presso be sure to supervise them so they don't get hurt and to make sure you get a great tasting result.