Tabucchi’s notion of time (e.g., aging) is a weird one. I grew up thinking it didn't really exist, that it was just something us humans invented as a measurement, like cm or mm. But I also used to think tomato soup was lava. Time is the only God, because it behaves in exactly the way any self-respecting God should: it continues to do its thing utterly dependably, and ignores everything else. The problem, I think, is that our scientific knowledge of time is so limited that in any discussion, we can't avoid drifting into metaphysics, which doesn't really add to the discussion. Regarding "time" as an entity, I feel we are like a caveman looking at the Mona Lisa and wondering how it was done what it could mean. We simply don't understand the extent of what we're looking at, and, like every generation, fall into the familiar trap that, because we are the here-and-now, we are the cleverest there's ever been, so we KNOW the answer, when, in fact, we're not much smarter than all the thousands of generations before us. The generations who follow us will behave in exactly the same way.
If you're into Aging and the Notion of Time in particular, read on.