How sound is the saying that if a servant dies at the age of 90, he will be forgiven and intercede for his family, and what is the evidence for this from the Prophetic hadiths?

The Prophet (peace be upon him) is reported to have said, on the authority of Anas ibn Malik (may Allah be pleased with him): "No one who lives for forty years in Islam but Allah diverts from him three types of afflictions: insanity, leprosy, and vitiligo. If he reaches fifty years, Allah eases his reckoning. If he reaches sixty, Allah grants him repentance to Him in what He loves. If he reaches seventy, Allah loves him and the inhabitants of the heavens love him. If he reaches eighty, Allah accepts his good deeds and overlooks his bad ones. If he reaches ninety, Allah forgives him his past and future sins, and he is called Allah's captive on His earth, and he intercedes for his household."

This hadith is not authentically attributed to the Messenger of Allah (peace be upon him). It has been declared weak by Ibn al-Jawzi, Al-Shawkani, Al-Albani, and Shu'ayb al-Arna'ut.