If he’s successful, Andrew Yang will be the third-youngest person to become president of the United States.His age, 45, and his experience as an entrepreneur in the tech sector — and lack of experience in politics — give him a perspective on the campaign and the presidency unlike his rivals for support in Iowa’s first-in-the-nation caucuses.The 2020 election “is about an opportunity for us to actually catch up to the real problems of 2020 and move our country forward,” Yang said during a weekend interview.