Yes, indeed, the longest lasting 35 mm camera system lens mount is now celebrating 50 years of existance. And 50 years of remarkable compatibility I must say, of all the well known brands for small frame cameras the Nikon F mount is the longest lasting and surviving mount that is still around.
There are many advantages to this of course, any lens made since 1956 or so can be used on modern cameras wich means the used lens market is huge. You might not get metering or autofocus but if you are prepared to do some of these things in manual mode then this is for you.
Canon changed their mount with the introduction of the digital cameras to their EF mount. There are even two types of EF mounts, one for the small APS-C sized digital cameras and one for their ”full frame” counterpart, the reason being that because of the tightness between the lens aft parts and the mirror some lenses designed for the 1,5 crop format would actually touch the mirror when it flips up if mounted on full frame cameras.
I have used older lenses with mechanical autofocus on my Nikon D70s and D300 cameras and both makes great use of them. I have even tested fully manual lenses and they work pretty well if you take the time to focus properly or use a sufficient large DOF of course :-)
The drawback is that the standard F-mount puts the lens a bit further from the focal plane than Canon and some other makers does, this means that it is not possible to use say Canon lenses on Nikon bodies while the reverse can be done with some success.
So happy birthday F-mount!