Is there any limit on how far back you can go for the portfolio? Is timing (current) more important or quality (meaning how advanced)?

I have things from when DS10 was 6 that I would love to include. I also have some essays and science experiments. Finally I have an amazing baby video.

Is it okay to include IQ test scores even if they aren't 'qualifying' as an extra if you have the portfolio and the qualifying acheivement scores?