This article and the lovely comments below the line really moved me today www.theguardian.com/lifeandstyle/commentisfree/2021/sep/23/proper-sobbing-and-perspective-what-i-learned-when-my-younger-daughter-left-home
Not too many years left before I will be in a similar position, I think of it regularly. And about my parents, whose sadness I never understood at the time.