I did this test a while back as well Sue, scored 7 then and scored 7 again now. Not too bad for a 63 year old wrinkly I suppose. I used to work for British Telecom years ago and obviously because the work involved lots of colour coded wires I had to undergo a colour blindness test at the job interview. I served my time as an electrical engineer so had known for a while that I had problems with differentiating greys / greens, so on interview day for BT I "winged " it. Whenever I got grey green wires I had to mark one, then cut a bit off both and take them outside into daylight, even then i struggled sometimes and would have to ask a passer-by to tell me which was which. I'd have made a great bomb disposal fella!
It'll be interesting to see what others here score and the age range