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1.
A sexually active person who is inbetween 60 and 70 years old.
Your grandmother is a sexagenarian.
by Roxanne April 14, 2005
17 17
 
2.
Someone who is no longer going done the hill at a slow pace, but is running at a full trot and can not stop themselves
Jim is a sexagenarian
by choad May 06, 2004
16 16