Instance variable access in Ruby

attr_reader.rb

class Person
  attr_reader :name

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

ted = Person.new("Ted", 25)
ted.name # "Ted"
ted.age # NoMethodError: undefined method `age' for #<Person:0x007ffb8a4a12c0 @name="Ted", @age=25>

manual_reader.rb

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

ted = Person.new("Ted", 25)
ted.name # "Ted"
ted.age # NoMethodError: undefined method `age' for #<Person:0x007ffb8a4a12c0 @name="Ted", @age=25>