No I'm questioning it. I'd be more than willing to see a counter-argument to my own. I understand how simultaneity comes into this.It builds up a huge bank of time that is created when the twins separate. This bank of time can only be cashed in once the twins reunite. This still doesn't explain why during the outbound journey, I believe experimental evidence will show that the relatively moving party will be aging slower without having to go back to the starting point.Now, this is one of many examples where considering time dilation alone is not enough. You also have the relativity of simultaneity. There is actually a nice paradox here (better than the twin paradox in my view). If you can resolve it, you go a fair way to understanding SR.
However, sadly, I can see from this and others posts that you have chosen the path where "relativity must be wrong" and "I'm going to disprove it".