I think its a because its not a list
JFK's Inaugural Address was given almost 60 years ago. It was an inspirational speech which addressed what is to be an American. The main themes were freedom, peace, God's role in our lives and service to others or personal accountability.
When Ponyboy says this phrase he means that they don't need to say words to share the problems they have in their life. Both of them have problems so they understand each other like no on do : Johny's parents do not pay attention to him; Pony must live his life with a big loss - death of his parents. So they both know how life can be unfair sometimes.
