Is it normal for a boy to start becoming interested in girls at age 10?

@Slade I didn't do that until I was 13.

@NankerPhelge everyones endocrine system is different in that department., just like height, weight, intelligence can also bloom early or late, maturity, teeth, hair, scent, etc. hormones vary per human.

@Mindful I started becoming aroused at 11 but it would be a couple more years before I first masturbated.