I think you have been lucky in your contacts. Talk to a few veteran, retired teachers over 70 or so before assuming others have had the same experience. Those veteran teachers will likely tell you “respect your elders” — whether veterans or otherwise —isn’t widely valued by many teens anymore, which I assume means it is no longer widely valued by many younger parents.
Of course I realize some bad things can come from blindly respecting ALL elders, if those elders are undeserving, for example the Catholic Church’s horrific sex abuse scandal. But I still find it sad that what my mother and father taught me as a basic value is now often considered old fashioned, or even just plain wrong.
Kudos to OP and his wife for doing a great job teaching values and kudos to their son for following their standards. We need more like them.