Michigan adverse acquisition requires delineation of property line and land use for 15 years. Does that change if owners change.

First, you should understand that the neighbor's survey showing they own a 32 ft. strip of the 80 acres does not mean they actually have superior title.  In the type of legal description involved, overlaps in descriptions can easily happen.  Second, the occupancy of the 32 ft., along with the rest of the 80 acres, by the same owner for over 50 years would establish adverse possession in that owner.  The recent deed would not destroy that owner's claim.  Third, in boundary situations like this, acquiescence should also be considered.  It has a lower burden of proof than adverse possession and generally softer rules on tacking.  In any boundary dispute, I would plead both and develop the evidence to see which is more applicable.