Sentence:  They number their age by <WSD>Moons</WSD> or Winters, and say a Woman or a Man is so many <WSD>Moons</WSD> old, and so they do with all memorable Actions in life, accounting it to be so many <WSD>Moons</WSD> or Winters since such or such a thing happened. "Note: in earlier modern English, many nouns were capitalized, similar to present day German." 
Meaning of the word marked with <WSD> tags:  A (month, particularly a lunar month).