words about age

  when you were borned  ,you are aninfant 
until you are one year old.

  Then you'll become toddler,this means you are a child from one years old to three years old.

  When you finish this stage , you have to go to school and you will grow up and waste your
teenager utill you 're done with school.

  Obviously,you graduate .and then you have to do what everyone else does , work. utill you find what is "the real world" , so you could call yourself as
adult .If you couldn't do whatever you want ,just because you have kids,a house , a car , a life . this is called
settle down.

   When you work for a long time , suddenly , you want to change .

   Congratulations, you are being in mid-life crisis. whether or not you could pass this stage , you will be called
elder.

   and then you know it.