Why do people get hoarser voice in 70s?

Poor technique : Good breathing and energy in the body lead to a good voice. As we age often people's energy levels drop and they lose muscle tone. Shallower breathing with less energy equals a weaker voice. In addition, people who age sometimes lose their hearing and they don't hear themselves as well. This loss of feedback sometimes makes them think they are speaking loudly and they end up speaking improperly.