Personally, I loved mowing as a kid...we all had chores to do BEFORE playtime. With 2500 acres to work, school granted extra time off for farm kids...and while that was real work, it was relatively easy work, pretty boring if you've never worked soil before...a lot of back and forth...and back and forth...but still cool and fun when you're a kid! I enjoyed a pretty good lifestyle derived from this...I was able to see the work hard, play hard thing at work as my parents both drag raced, I had excellent go carts, minibikes, little motorcycles, the best baseball gloves, bats, cleats...some may call it being spoiled and many did...but they were the ones who didn't put in the work either...I wouldn't have traded my childhood for anything!!!
We all have differing opinions on this, there's no manual...this is on a case by case basis. City kids? Probably not that young as they don't generally have the maturity of kids raised on a farm. So while that may seem too young for many, I'd say it works quite well for others. Your actual mileage may vary...LOL
And yes, we had to do the make-up work for school too...