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.
Jones, Andrew Zimmerman. Why Do Stars Burn and What Happens When They Die? ThoughtCo, Aug. 27, 2017, thoughtco.com/why-stars-burn-and-star-death-2698853. Jones, Andrew Zimmerman. (2017, August 27). Why Do Stars Burn and What Happens When They Die? Retrieved from https://www.thoughtco.com/why-stars-burn-and-star-death-2698853 Jones, Andrew Zimmerman. Why Do Stars Burn and What Happens When They Die? ThoughtCo. https://www.thoughtco.com/why-stars-burn-and-star-death-2698853 (accessed February 16, 2018).