...stopped blogging - slowly left the habit of taking pictures.

that, indeed, gives some feed for thinking.

one needs to preserve memories, too. Though I hardly ever check old photos.

as for me - I take pics not exactly for presentation in the blog
(except some captures taken exactly for a certain challenge prompt), but for the pleasure of creating visual art, it is a pleasurable process for me. if I could draw perhaps I might go that way, but instead I developed this habit.

and, I look through my old photos on a regular basis, sometimes even randomly. I seriously consider a mindless taking pics without getting back to them later, to be a weak habit.... somewhat similar to mindless consumption and shopping: more! more! more! - without looking back at what you already possess.

Your son's question was really deep, and I think you should try to give him a more serious answer, he deserves it.