Doubt

Vidomina had mentioned earlier that the Duke had his 200th birthday three months ago.

That would be an astounding age to reach back on Earth, but in this universe, it was not something unprecedented. This was especially true for people who manage to earn titles like the Duke. Even if Baiyi cast aside the possibility of life-extending spells or other miraculous means, the Duke — who had made a living as a renowned martial artist — was an exceptional powerhouse himself. Baiyi deduced that the man was at least really close to Legendary-level when he was at the prime of his powers.