Thread:Mabian/@comment-28804220-20161024051117/@comment-27701762-20161024052241

I've provided responses in the edit summaries.

What you've provided is not technically "proof." It is an interpretation of what Toby's tweets mean. I am not declaring that your interpretation is incorrect, but as I said in the summaries, they are as close to canonical information that we get from Toby about his intention about their relative ages, and so until we either get further clarification on his comment, or he rescinds it entirely, it is better to leave the information as it is.

But to provide some further explanation, to use the "I think" as a key that it is supposed to be left up to the player ignores the fact that Toby has not made any similar comments about the things that we already know are supposed to be left up to the player, such as the gender of Frisk and Chara. Toby has not, to my knowledge, claimed that he thinks Frisk and Chara are one gender or another, since doing so would constitute imposing his own views on something the players are supposed to decide for themselves. If Toby had wanted to leave the ages of the brothers completely open, he would not have tweeted the comment in the first place.

To provide my (and the Wiki's) current interpretation of the tweet, Toby is saying that he had intended for Sans to be the older of the two brothers. He did not provide any direct evidence within the game on that issue, so it is entirely possible for someone to reach the opposite conclusion, and Toby is fine with that. Instead he is just offering what his own vision was, rather than what players absolutely need to think as part of their own personal vision.