estilo.rb

class PERSON
  LIFE_stage = {childhood:12,teenager:19,adult:50}
  LEGAL_AGE = 18
  attr_reader :name
  attr_writer :name

    def initialize (name, age)
      @name = name
      @age = age
    end
    def age
      @age
    end

    def life_stage
      if @age < LIFE_stage[:childhood]
        :childhood
      elsif @age < LIFE_stage[:teenager]
        :teenager
      elsif @age < LIFE_stage[:adult]
        :adult
      else
        :elder
      end
    end

    def legal
      @age >= LEGAL_AGE
    end
end


# Esta parte del código son pruebas. 
# Antes y después deben de imprimir puros "true"
fernando = PERSON.new("Fernando",5)
juan = PERSON.new("Juan",45)
laura = PERSON.new("Laura",87)
andrea = PERSON.new("Andrea",13)

puts fernando.legal == false
puts juan.legal == true
puts laura.legal == true
puts andrea.legal == false

puts fernando.life_stage == :childhood
puts juan.life_stage == :adult
puts laura.life_stage == :elder
puts andrea.life_stage == :teenager

puts laura.age == 87
laura.name = "Ximena"
puts laura.name == "Ximena"