Sisters 23? Still not married? I was 24 when I married my wife. We dated for about a year before we decided to get hitched. We actually had people betting it wouldn't last (we were both partiers). Hell, 28 years later we're still together and most of them have already been divorced and remarried.
All I can really say is...
...if your sister and her boyfriend really want to get married there is nothing you can say that will talk her out of it. If they do get married then the marriage will last as long as both of them want it to last.
But, you know your sister better than anyone here and all I can honestly say is...
...whatever decision they make, I wish them the best... and you too.
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