Girls

scala> case class Girl(name: String, age: Option[Int] = None)
defined class Girl

scala> Girl(name = "Sue")
res7: Girl = Girl(Sue,None)

scala> Girl(name = "Betty", age = Some(29))
res8: Girl = Girl(Betty,Some(29))

scala> res8.age match {
     | case Some(a) => s"$a years old"
     | case None => "no idea how old she is"
     | }
res9: String = 29 years old

scala> res8.age foreach { a => println(s"$a years on the planet") }
29 years on the planet

scala> val g3 = Girl("Lynn")
g3: Girl = Girl(Lynn,None)

scala> g3.age foreach { a => println(s"$a years on the planet") }

scala> 

Note that you can call foreach on an Option[T] and it is treated like a collection of zero or one items.

Java 8's http://docs.oracle.com/javase/8/docs/api/java/util/Optional.html is a less useful version of Scala's Option.