In 1969, during the first Moon landing, one of the first instruments deployed was a permanent laser device pointed at Earth.
From memory, it improved measurements of the distance between Earth and Moon down to plus or minus 12 inches.
Is it possible that device is still working after more than 50 years?
It’s a reflector, so it should theoretically last as long as the moon itself.
It’s a retroreflector, A passive device. So long as we have a laser powerful enough to reach the Moon and a telescope to detect the dot, it will work.