1. (Physiology) the faculty or sense by which sound is perceived. 2. an opportunity to be listened to. 3. (General Physics) the range within which sound can be heard; earshot. 4. (Law) the investigation of a matter by a court of law, esp the preliminary inquiry into an indictable crime by magistrates. 5.
The grey hair ârule of thumbâ is that by the age of 50, half of the population have lost the colour in 50% of their hair. When researchers tested this rule, they found that 74% of people aged between 45 and 65 had grey hair, with an average intensity of 27%. Generally, men have more grey hair than women.
Natural Eye Color Change. Newborn babies don't have melanin in their eyes, so they begin life with blue or almost colorless eyes. The melanin gradually increases, and by about three years of age, their eyes will have darkened to their true color. Disease, trauma, and aging can lead to changes in eye color. The more your eyes are exposed to the sunâs harmful rays, the higher your risk is to developing cataracts or macular degeneration later in life.