Ageing can feel remarkably sudden. One morning you awake to find new aches, or lapses in strength and memory that you could swear were not present just a few days prior. We do not literally age overnight, but as research is increasingly showing, we may not do so in a steady, linear path either.

Over the past decade a multitude of studies have suggested that ageing – at least for certain organs and bodily systems – may actually consist of long periods of stability, punctuated by inflection points or periods of rapid biological change. This shift in thinking has raised hopes for anti-ageing medicines. But it could also make us rethink our attitude to ageing in general, viewing it as a dynamic and varied journey – rather than simply a slow march of attrition and breakdown.

The latest study bolstering this view, published in Nature Communications, used a large number of brain scans to show that the structure and........

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