Turtle.rb

module Named
  attr_accessor :name

  def introduce
    "My name is #{name}, I am #{age} years old. I am a #{self.class.name}."
  end
end

class Turtle
  include Named
  attr_accessor :age
end

shelley = Turtle::new
shelley.age = 10
shelley.name = "Shelley"

puts shelley.introduce

My name is Shelley, I am 100 years old. I am a Turtle.