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.
1 For these stars, the hotter they are, the brighter. 2  These stars are in the most stable part of their existence; this stage generally lasts for about 5 billion years. 3  As stars begin to die, they become giants and supergiants (above the main sequence).