Snoring in people may have different causes including poor sleeping posture, age, alcohol, nasal problems and excessive weight. In some people, snoring can be stopped by changing lifestyle while others may require using commercial devices, such as CPAP.
Snoring occurs when air can't move efficiently through the nose and mouth while a person is sleeping. This is mainly because the airway has become narrow. Avoiding alcohol before sleep, considering weight loss and checking on the sleeping posture can help stop snoring in some people. Older people's airways tends to become narrow as they age, causing them to snore, as stated by Helpguide