John is a $55-$year$-$old man who was recently fired from his job with an advertising agency. He wants to sue for age discrimination. Which of the following is true?

He must first file a complaint with the Equal Employment Opportunity Commission $($EEOC$)$

The Age Discrimination in Employment Act $($ADEA$)$ only covers employees age $60$ and older

The agency bears the initial burden of providing that it fired John for legitimate, nondiscriminatory reasons

No statute of limitations restricts when John must file his claim