LeSoraAmari
The Grand Herald of Tea
all he does is release the stored up energy and combines it with his sword. the reason he is powerful is cause he's old and has had time to store up energy
The defining factor of his power is his rank, not his age. As an A-Class, he can only ever use attacks/be as strong as one as that is his current ranking.
That includes all of his other skills, they'll all be at an A-Class level. Age does usually play a factor in it, but in this case it doesn't.