Get person's age in Ruby -


I would like to get the age of one person from my birthday now - birthday / 365 does not work Because because in some years there are 366 days I came up with the following code: 

  now = date date

Is there any other ruby ​​to calculate the age?

I know that I am late for the party, but the acceptable answer will be broken When one leap will try to work for the age of a person born on February 29. The reason for this is that call to birthday.to_date.change (: year => now.year) creates an invalid date .

I have the following code (in a Rail project) instead: 

  DEF Era (Dob) now = Time.On. NCTCTO_adet now.your-dob.yure- ((now MMTATOBMMM || (now.mm) == dob.month and now.day> gt; = dob.day )) 0: 1) End

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