Aging is not something for which the term cure should be applied. Perhaps some of the debilitating conditions associated with aging can be remedied. Yet, until it is hypothetically possible to stop time, aging will occur, with or without debilitating conditions.
Discussion
It depends how you look at it, there are biologically immortal organisms. Aging can hypothetically be stopped, obviously we're not there yet. https://edition.cnn.com/2023/01/12/health/reversing-aging-scn-wellness/index.html for example.
I think we will have to come to some common understanding of aging before I can understand the point you are making. The article you tagged suggests that two mice having a common beginning in time are somehow different in age. That doesn’t process with me and how I understand age. That one mouse may have been affected by deterioration and disease to a higher measure than the other makes sense to me. But it would not seem to have affect the age of the mice as I understand aging. To my mind, the affect of deterioration and disease is the issue, not aging.
You're overthinking it. It's just a hypothetical question based loosely on the premise that we may be able to stop aging in future.