A: Ages 6 to 96 is what the actual box says but if you help a child that is younger that should be fine as well. Hope this helps.
A: The recommended age is 6+
A: Yes, over time your garden will need to be replanted. You can use left over materials that you may have from the kit or purchase new soil and seeds from your local garden center. You will basically take the materials out of the jar and rework the project.
A: My daughters planted the seeds provided in the kit. They do not sprout actual flowers but more like a petit grass/ground cover. We did not transplant as there was really no reason to.