sixteen Look up sixteen at Dictionary.com
Old English sixtyne, from siex (see six) + -teen. Cf. Old Frisian sextine, Middle Dutch sestien, Old Norse sextan.
The age of the gods is always sixteen. Sixteen represents the number of perfection, of plenitude. In man it is after the sixteenth year that the first elements of decay begin to appear, and when the moon reaches the sixteenth digit it begins to decrease. [Alain Daniélou, "The Myths and Gods of India"]