You're the only one making a debate about it. I added an additional item of information. Frederik had no problem with this and noted:
- within the specific example he posed, there was no ambiguity in his wording
- for the general case, you cannot use such wording (agreeing with me about this).
At this point, there was perfect closure and mutual understanding. You
chose to try and turn it into a debate. For some reason, you don't like the idea that there is anything wrong with the statement "the twin that spends more time at higher speed ages less"; I believe, most everyone else understands that for the general case, interpreted as words are normally used, it is wrong. For suitably constrained cases, it is accurate.