As someone who has a farm and regularly asks for knowledge transfers from the older farmers around me.. it’ll be difficult when they move on.
It’s things you wouldn’t expect either, like how to install a new piston & hydraulics line on a tractor. Or how to repair an old diesel motor. Some people on HN might know that, I know some of that now. However, generally they are all older and their kids moved on. In terms of a generational knowledge gap I can think of no greater one.