you look at a guy/girl and feel all horny. you start panting. rush up to the guy/girl raip him/her. have sex. rub against each other. ect.
no
very fast!!
That is the starting age yes
In males, testosterone and androgen are the principal sex hormones responsible for puberty. The hormone that dominates female development is estradiol and estrogen.
exercising does change some chemicals in your body. every body is different so hormone change is possible.