I was reading up on the life expectancy of different building materials when I came across this gem.
Screenshot is of page 122 https://www.portseattle.org/sites/default/files/2025-02/SEA-SIPP%20Technical%20Report%20Appendix%20C%20Life%20Expectancy%20of%20Building%20Materials.pdf
I guess the ethernet cables could last that long, but they rate house wiring to a lower lifetime. Ethernet cables are not "wireless", however.
The only other wireless systems I can think of are garage door openers, but they are definitely not expected to last 50 years.
There are few exceptions to this rule. The one I always think of is the tape drive. 75 years on and still going strong with advancements in storage amount and encryption etc. but otherwise, largely still the same technology.