User blog comment:Videogamep/Marco's Age/@comment-5962458-20130402071101

What led you to think that this pic was taken 20 years ago??

Jimbei became a sichibukai 9 years ago and before that there was no indication throughout the fishman island nor the sun pirates that they were protected or even allied with the whitebeard pirates.

So my guess is that this event in the picture took place between 5-9 years ago and that's why there is no dramatic change in the appearance of Marco but of the other two as well.