Wa alaykum assalam warahmatullah wabarakatuh.

In the Name of Allah, the All-Merciful, the Mercy-Giving.

All praise is due to Allah. Peace and blessings be upon His Messenger Muhammad.

For women who have reached the menopause age, the waiting period (iddah) after divorce shall be three lunar months starting after the pronouncement of divorce. Almighty Allah says in the Quran what means “As to those of your women who anticipate no further menstruation- if you are uncertain [as to their term]- then their waiting period  shall be three months, [just] as it shall be for those, who have not [yet] menstruated.” (Quran 65:4)

Almighty Allah knows best.