Oh yes... 7 should be great!
I've taught a bunch of cub scouts 20 years ago.... they all still have their fingers.... there was no sign of any blood anywhere! lol
You have to be well prepared tho. As Charlie noticed... the attention span isn't that good yet.... 10 minutes is about all you get... but that's the same with a lot of grown ups. So keep the sessions short, try for things that can be finished in no more then two sessions and don't be discouraged if you didn't hit on the right subject or method the first time. Keep your eyes and ears open for subjects that interest them.... if they're into sports do sport themes.... girls might like animals ....
Remember saefty ... teach it from the very beginning... wear a mask... keep fingers to the side of the blade...etc...
I've found one way was to draw straight and curved lines on a board draw a few marks on the sides....and tell them it's a little like driving a car... to try to stay on the line and not have an accident ( depending on the child you can call the marks , dogs, trees etc.... )
Children have great imaginations and will probably come up with more things like that.
Another thing that works well is to ask for one of their own drawings... turn it into a cut out they can then colour.... makes children feel you value their work and they love seeing it in wood... once they can do that.. next step it to make a puzzle out of their drawings! Talk about pride!!! They love that! Plus there's an unlimited supply of patterns coming straight form the designers!
One thing I did when I worked with disabled children was to prepare a pattern of a simple x-mas tree... the only thing they had to cut was 3 short cuts towards the inside ( the branches) they were done in no time flat... nobody had to wait for their turn too long and they had this " I can do this" experience right away..... each and every one of them wanted to do it again!
Just don't expect perfection... FUN is the only thing that counts at this stage
So.... go have fun... enjoy the time spend with kids
Juvy