The British refer to young people who grew up from 1979 to 1990--during the time Margaret Thatcher was prime minister--as ''Thatcher's Children.'' We could easily say the same of the approximately 30 million Americans who were born during the Reagan years, me included. We would be a decent generation to consider ourselves Reagan's Children. For every young person needs heroes. This generation has had few, and Ronald Reagan was the greatest. As a 13-year-old, I wrote a letter to President Reagan: ''I have certainly been inspired by you and that which you stood for ... I will stand firm for...