The comet cardigan is a made to wear and size inclusive pattern. This means you take your own measurements first and then follow the instructions. This means it can be made for any size and age.
It is also a unisex design, so can be made for anyone. The pattern uses US terminology and is written in English only.
Its a advanced beginner level, however there are detailed steps and photos throughout top help guide you.
You will need any type of 8ply (DK) weight yarn in any fibre. I used acrylic to make mine and used roughly 1550m for the size small (UK 8).