what is the mean of 'of' ' in my post?

actually, I should ask whcih defination of the 'of ' in yahoo dictionary does the writer use?

----> He is of average weight <-----


source

Physically, Julián look older than most of other men of his age. He is of average weight, neither too fat nor too thin. He has a lovely plump face with sparkling dark-coloured eyes and a sensual well-shaped mouth. His glossy curly hazel hair falls over his curling eyelashes. He is stunningly handsome. There is something in the way he looks that rivets all women's attention. He is usually dressed casual. He prefers wearing informal, comfortable clothes rather than his "intolerable" suits and "horrible" ties (he hates formal clothing) I do not think I have ever seen him in a perfectly ironed suit.