Proposed control-systems framework: functional reserve as the primary target in aging
The abstract proposes a framework that models aging as instability in a coupled mitochondrial-epigenetic axis and names functional reserve, not lifespan, as the primary therapeutic target. It is a proposal, not a validated product. [1]
Automatic summary · not editorially reviewed
The key findings
The abstract says aging's main clinical manifestation is progressive loss of functional reserve, not mortality. [1]
The mitochondrial-epigenetic axis is called central only for network connectivity and therapeutic tractability, with no causal primacy claimed. [1]
Five capacities meet the three criteria at the stated thresholds, and sensitivity analysis shows four or seven under other thresholds. [1]
The source at a glance
- Study type / format
- Abstract of a proposed conceptual framework
- Population / context
- Human aging as discussed in a proposed clinical framework
- Summary based on
- Study abstract
- Original publication
- August 31, 2026
Proposed reframing of functional aging
The abstract states that the main clinical manifestation of aging is not mortality but the progressive loss of functional reserve, the surplus physiological capacity that separates independent function from disability. It says existing geroscience frameworks describe molecular aging in detail but give clinicians little basis for prioritizing targets. The authors therefore reframe functional aging as a control systems problem, modeling aging as progressive instability within a coupled, bidirectional mitochondrial-epigenetic axis.
Supporting source [1]
Five capacities meet three stated criteria
The abstract calls this axis central in two limited senses only: network connectivity and therapeutic tractability. It explicitly claims no causal primacy over mTOR signaling, inflammaging, senescence, proteostasis failure, telomere attrition or stem cell exhaustion. Candidate capacities were scored against three conjunctive criteria: independence, necessity and modifiability. Five satisfy them at the stated thresholds, and a sensitivity analysis reports which threshold changes would instead yield four or seven, so the count follows from a stated procedure rather than being a natural constant.
Supporting source [1]
Proposed hierarchy and its stated test
Interventions are mapped onto these capacities in a separate layer. The result is described as a hierarchically ordered, clinically actionable, falsifiable architecture in which functional reserve is the primary therapeutic target and lifespan a downstream consequence. Its primary test, deleting any single capacity from longitudinal models, is said to be evaluable in existing cohorts without new data collection. The abstract does not report results from such a test, and it does not establish that targeting functional reserve extends lifespan.
Supporting source [1]
How to interpret this
This is an abstract only; the full text was not reviewed. It describes a proposed framework, not a validated or approved product, and reports no outcome data. The five-capacity count depends on stated thresholds, and the proposed test in existing cohorts is not reported as performed.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
O'Leary RT. · europepmc.org · August 31, 2026