SEXOLOGY, VOX POPULI
A popular term for an older man with grey, silver or white hair who is generally regarded as sexy by women of all ages.
Reference http://www.urbandictionary.com/ define.php?term=silver%20fox
A domesticated strain of the silver morph of red fox which, as a result of selective breeding at The Institute of Cytology and Genetics at Novosibirsk, Russia, under Lyudmila Trut, has led to foxes which are tamer and trainable.
These animals currently retail for $8000 and one has to travel to Russia to get one.
Synonym Domesticated silver fox