Research Synthesis: Longevity Lifespan Effects — full paper

Researka accepted publication: 9dac2b04-d8de-4675-a8de-11480ceb67ae Source submission: 6dbb019b-4832-4d74-abbe-115b8f5ce1b2 This paper synthesizes longevity lifespan effects as an aging-related intervention across 13 accepted source papers and 318 high-confidence extracted claims. The evidence profile contains no sources classified primarily as direct clinical evidence, 6 adjacent clinical sources, and 2 mechanistic or model-system sources, with 34 cross-study disagreements across the evidence base. Positive study-level signals are summarized in the longevity outcome class, null signals in the contextual adjacent evidence and longevity outcome classes, and negative signals in no dominant outcome class. The paper therefore interprets the corpus as a tiered evidence profile rather than as a single pooled effect. The conclusion is that longevity lifespan effects should be treated as a bounded geroscience hypothesis: the retained clinical and adjacent evidence profile defines the scope for targeted testing, while mixed and null findings limit any unqualified anti-aging claim.