Average mid way through reception so turning 5.
My oldest could write like this in pre-school at just turned 4 (couldn't do the diagrams before that) and she continues to be working at the top of her class and needing extra work in juniors.
For a couple of kids in her class this would be normal for year 2 or even year 3 but they get extra help.
Academically strong state school in wealthy area.