Ben Franklin staying young ... described by Andrew Ellicott

After completing the survey of the extension of the Pa and Va boundary (the continuation of the Mason-Dixon line) in 1784 and the western border of PA in 1785, Major Andrew Ellicott, 31 years old (1754-1820) was invited to spend a day - Dec 4, 1785 - with the 79 year old Benjamin Franklin (1706-1790).
Franklin's "little room" was "filled with old philosophical Instruments, Papers,Boxes, Tables, and Stools" and at 10:00 Franklin set water over the fire (over a 'Franklin fireplace?) and shaved himself.  Fighting aging, he insisted on doing it all himself rather than to give in, thus increasing his "infirmaries."  Franklin described changing his course at age 70... and "walked back" the years, rather than age.