Frank Zane looked about 75 in that clip though he was very lean and fit. You got to give it to the guy, he's an educated guy:
Awarded a Master of Arts Degree in Experimental Psychology from California State University San Bernardino, California in 1990.
Taught mathematics, chemistry, physics, natural sciences, physical education, and psychology in Pennsylvania, New Jersey, Florida, and Los Angeles, California 1964 through 1977.
AND he's won 3 Sandow trophies! How many other Mr.O's can say that?