In English Darby and Joan is referred to the old couples who are still being like lovebirds.  Attached below is the story of an enviable one.

https://www.toutiao.com/a6701118465505231364/

PS  Well, the words "人這一輩子，就是幾張照片的事." said by the shutterbug husband is somewhat sentimental.  In these days my wife was busy sorting out family old, faded photos into different stages, and trying to make them new, electronically-generated albums.  You know how we felt when we saw those pictures again.