July 23rd, 2026
The biochemistry of aging is enormously complex, and it is very hard to pick apart which changes are definitively cause versus effect, and which changes are definitively more important than others. The only robust approach is to build a therapy that fixes just one change in isolation, and observe the results. This is not always possible or practical. When it can be done, a great deal is learned, however. See the outcome of the development of the first senolytic drugs on the state of knowledge regarding the role and relative importance of senescent cells in degenerative aging, for example. But the lack of such targeted and relatively effective therapies for most other potentially important mechanisms of aging allows a wide diversity of viewpoints to arise, as any new hypothesis regarding the importance of any given form of damage or dysfunction is hard to prove or disprove.
Aging is often framed as the gradual erosion of proteostasis, driven by declining chaperone capacity, impaired degradation, and dysregulated protein synthesis. Yet this view implicitly assumes that proteins fail primarily because they misfold or escape clearance. Increasing evidence instead points to a more fundamental problem: aging disrupts the spatial management of the proteome. Gradually, proteins are misplaced, signaling pathways are uncoupled from their compartments, and condensates that were once dynamic become pathological.
