What is the estimated age of earth? 10 billion years 6.4 billion years 2.6 billion years 4.6 billion years

The estimated age of the earth is 4.543 billion years, which rounds to 4.6 billion years. 

Hope this helped.

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it