What? Don't you mean 52? (Or actually almost 54 by now?)
So, back in 1994, Peter H. Salus wrote a book "A Quarter Century of Unix", and then an article with the title "Unix at 25" for the October 1994 issue of Byte Magazine.
At the in-person MUUG meeting last week, one of the give-aways was a print edition of that issue of Byte. For those who are sad they missed out in this prized issue, here's an electronic copy of the Salus article...
https://www.landley.net/history/mirror/unix/art3.htm
And for those interested in a copy of his book (either purchasing a print copy, or downloading the PDF), you can find out more about it here...
https://wiki.tuhs.org/doku.php?id=publications:quarter_century_of_unix
... along with other historical Unix publications here...
https://wiki.tuhs.org/doku.php?id=publications:start
Enjoy the trip down memory lane!
Gilbert