What is the comprehensive answer, if you please, regarding the causes of longevity?

The causes of a long life are: piety towards Allah Almighty, honoring one's parents, and maintaining kinship ties, as the Prophet (peace be upon him) said: "Whoever wishes that his provision be expanded for him and his life span be extended, let him maintain his ties of kinship," and his saying: "Nothing increases one's lifespan except righteousness."