Somewhere in your life is a “last time” you did something without realizing it was the last.

There was a last time you carried a child who could still be carried, a last visit to a house, a last ordinary conversation with someone before things changed. None of these announced themselves. They passed as normal, and only later did they turn out to have been a door closing.

This is not a reason for anxiety, since you cannot track it and trying would ruin the present. It is more a reason for a little extra attention in things that are ongoing and precious. Be somewhat present for the routine ones, since some of them are quietly the last.