Hmmm, I do see the point that older couples who've been living together for years don't quite have the 'starting out on life together' air of excitement that might have accompanied the wedding day a generation ago.
And so having a really big white wedding to then go back to living as man-and-wife as they've been effectively doing for the last ten years might seem a strange thing to do, especially to those less used to living together being the norm. That is quite a recent thing, isn't it? My mother and MIL married young in order to be able to leave home. So it's only our generation that sees getting married in your thirties as normal?