Create your family chart in the app, print it for the fridge, then keep it current with taps or Siri. Kids keep using the page. Android follows Play Store readiness.
The paper stays. The parent phone keeps up.
Teenagers can do the laundry start to finish, mow the front yard, cook a weeknight dinner, wash the car, babysit a younger sibling for an hour, clean their own bathroom. If your family pays for bigger jobs, keep those rules explicit; stars can still track the daily rhythm. The chart is an agreement more than a chore list at this point.
Six to ten, but each one is bigger. A teenager does not need twelve rows; they need three or four jobs that actually move the household forward. Mow, laundry, dinner, bathroom. The rest can stay informal.
Stars are a record, not a currency. Use them to see what happened during the week. If your family pays for bigger extra jobs, keep that rule separate from ordinary family responsibilities.