A 101-year-old says the key to his longevity is refusing to act his age

Jack Weber exercises with light weights.

Mark Adam Miller / Business Insider

• Jack Weber, 101, maintains a youthful mindset to stay active and engaged in life.
• Despite losing his wife and friends, Weber chooses to embrace the present.
• Weber's daily routine includes exercise, outdoor activities, and a positive outlook.

Jack Weber is 101 years old. He's outlived his wife, buried all of his best friends, and lived through a world war, the Great Depression, and pandemics.