Board Thread:Questions and Answers/@comment-28067574-20190903053053/@comment-32182236-20190903121201

Gerson was in his prime years during the war. So he was probably around Alphys' current age during the war.

And Alphys didn't have to be around when Chara fell. It could have been common knolwedge. There were witnesses, that's why Asriel's story could even have been told to us.

So there'd be plenty of evidence that the golden flowers came from the surface world, and the first would have historical significance.

But even if we do say that Alphys was around when Chara fell, this still isn't a problem, considering that Gerson was around far longer. It could be that it takes longer to start aging.

Asgore named the Kingdom of Monsters, so he was around since the dawn of the monster kingdom. That likely puts him as older than even Gerson. But he's a Boss Monster, so that makes sense.