It may be more accurate to say that street shots hold more interest the older they are. A beautiful photograph that happens to be street will probably remain beautiful while a shot tending towards documentary will probably hold more interest in 50 years time. Then again I may well be wrong and one does have current styles and fads to contend with which the viewer brings with them.
Mike
Depends on what you mean by "interest," Mike. It also depends on what you mean by "beautiful." In my own understanding of the term, street rarely is "beautiful," but it's always "significant." Which is a point people miss unless they're familiar with the genre. Here are the last two paragraphs from my essay "On Street Photography," which is here on LuLa at
https://luminous-landscape.com/on-street-photography/.
"An historical novelist guesses at the past on the best evidence he can find, but a photograph isn't a guess; it's an artifact that has captured time. And so, a street photograph that has captured not only the visages of its subjects but the story that surrounds their actions can be a more convincing reminder of how things were than any novel or any straight, posed documentary photograph.
"Although good street photography is a powerful art form, it's also a way of recording what people really are like, and, for those after us, a way of learning what we were like. Seems to me that besides the satisfaction it can give you, those two things alone make it worthwhile."