Janet Yellen
Fed Chair Janet Yellen is scheduled to address the House Financial Services Committee at 10 a.m. ET Wednesday. REUTERS/Jason Reed

Janet Yellen is set to become not only the first woman heading the Federal Reserve but also the oldest at 67 years and five months when she assumes the post on Feb. 1, 2014. Her predecessor, Ben Bernanke, was only 52 when he assumed command in 2006.

Here is a list of the longest-serving chairmen of the U.S. central bank, starting with the one who served the longest.

1. William M. Martin: 18 years and 9 months, from 1951 to 1970

2. Alan Greenspan: 18 years and five months, from 1987 to 2006

3. Marriner S. Ecles: 13 years and two months, from 1934 to 1948

4. Paul A. Volcker: 8 years and six days, from 1979 to 1987

5. Ben S. Bernanke: 8 years, from 2006 to 2014

6. Arthur F. Burns: 8 years, from 1970 to 1978

7. William P. Harding: 6 years, from 1916 to 1922

8. Daniel R. Crissinger: 4 years and four months, from 1923 to 1927

9. Thomas B. McCabe: 2 years and 11 months, from 1948 to 1951

10. Roy A. Young: 2 years and 10 months, from 1927 to 1930