I was thinking about how Marco looks the same now as he did when he was at Fishman Island which was probably about 20 years before the current time. My theory is that he uses his DF to stay young since we know it is a pheoeix DF and phoenixes are immortal, renewing themselves from their own ashes, so it it possible that his flames keep him young since he doesn't look very old even though he is at least 45 or 50.
Marco at Fishman Island.
What do you guys think?