To be fair to Alan Cumming, when I did my first TA for my honeymoon back in 2015 when I was still in my 20s, lots of our friends and family did express surprise that we were going to voluntarily lock ourselves on a ship for a week with a bunch of old duffers. Especially because we were known for all day drinking and general hellraising. And yeah, most people were decades older than us but we had a blast and we will both hit Diamond by the end of the year. Maybe being real ale pub type people we already knew that age is not a barrier to being fun or interesting to be around.
I hope Cunard continue to be able to bring in new passengers who are willing to overlook the stereotypes - so long as they're willing to abide by the dress code!