I was sifting through music and fount this! Now, I'm not taking away N_B's choice, because like I said, that fits his young self perfectly! But when I went looking for music for "Fugitive Matthias" (S.A.) This is what I was looking for.
Youtube - Brian Tyler, Transformers Prime - Optimus Returns
This says, "I've had sorrow, I've had shame, I've been outwitted, and I've been defeated. I've had a full life.  I'm not the best King ever, and I'm not perfect, but hang it all I will not give UP on those who look to me for protection. (The Kingdom of Morcia.)
"I have had a full life already. But it is not over yet." -something I think Matthais would say before his next battle.
If ya'll think it's good, we can have a Young anthem and a Old anthem! :P