Do people lose self-control as they age? Does it happen because they have accumulated frustration and Midlife-Crisis?

My parents are unable to self-control their alcohol consumption and I am worried about their health. I am trying to understand them and I really can't because I can most of the times control the amount of alcohol I drink. Does willpower decrease with age?

Do people lose self-control as they age? Does it happen because they have accumulated frustration and Midlife-Crisis?
Post Opinion