I would say, rather, "...to which we don't differentially attribute causes other than the passage of time."
OK, I'll accept that. I see your point.
However such an approach would require flexibility with what you'd call "disease" or "normality". For example, old people lose muscle mass and cannot acquire it as easily as young people. It it "normal"? It it a "disease"? If you develop a drug that you can take to fix that problem (but you'll have to keep on taking it forever), will you describe it as having defeated a disease?
Well, I'm not exactly sure what we mean by requiring flexibility here, but I would certainly agree that our flexibility with respect to what's a disease and what's normal aging are related.
To put this another way, I would say "effects of disease D" and "natural effects of aging" are both social constructs, and that the psychological/cultural constraints that cause some pattern of observations X to get tagged with the first label also inhibit X from getting tagged with the second label.
None of which really has a damned thing to do with ...
Google's announcement, Time magazine rather sensationalist headline.
In any case, it's nice to know that Google set its sights to "challenge ... aging and associated diseases". Apple's Tim Cook:
For too many of our friends and family, life has been cut short or the quality of their life is too often lacking. Art is one of the crazy ones who thinks it doesn’t have to be this way.
One more step towards "world optimization".