Curb Zone: The curb zone is the first 0.15 m (6 in) of the sidewalk corridor, located adjacent to the roadway. It is an integral part of the road/drainage. system and keeps excess water off the sidewalk corridor.
The average age for the beginning stages of puberty is 10.5 years in girls and 11.5 years in boys. The average length of time it takes for sexual changes to be complete is about 4 years. Pubertal changes occur because of the influence of hormones.
So, the beginning of the development that comes with puberty varies from person to person â and that's completely normal. The earliest physical change of puberty for girls is usually breast development, which most often begins around 10 or 11 years. But it's perfectly normal for breast development to start anytime between the ages of 7 and 13.