Is zakat obligatory on inherited money from the past four years or only from the last six months, knowing that the distribution of the inheritance took place six months ago?

"Inherited wealth transfers ownership to the heir immediately upon the death of the deceased. Therefore, the wife must pay zakat on her share for the past four years, starting from the day her father passed away, provided her share reaches the zakat threshold. The Malikis hold the view that inherited wealth is not subject to zakat until a full year has passed from the day it was taken possession of."