On the lateral surface of the human brain, the central sulcus separates the frontal lobe from the parietal lobe. The lateral sulcus separates the frontal lobe from the temporal lobe. The frontal lobe bottom can be divided into a lateral, polar, orbital (above the orbit; also called basal or ventral), and medial part.
The age of an individual star can vary; they were all made at different times and have different life spans. Stars can range from a few million to a several billion years old. The oldest star yet discovered, HE 1523-0901, is an estimated 13.2 billion years old.
Age of the galaxy. There is one good indicator that our galaxy is very old: Indicator: The sun is one of countless numbers of stars in our galaxy. The galaxy is over 100,000 light years across. This means that light from some stars in our galaxy has taken many tens of thousands of years to reach earth.