As Swami Sivananda said,

Practice of Brahmacharya gives good health, inner strength, peace of mind and long life. It invigorates the mind and nerves. It helps to conserve physical and mental energy. It augments memory, will force and brain power. It bestows tremendous strength, vigour and vitality. Strength and fortitude are obtained... He who is established in Brahmacharya will have lustrous eyes, a sweet voice and a beautiful complexion.