Immunity as Recursive Phase-Closure articulates the immune system as a recursive closure engine preserving coherent biological identity under continuous perturbation. Eighteen major immune cell populations across innate and adaptive immunity are mapped with structural precision onto a ninefold recursive phase lattice governing initiation, interpretation, modulation, containment, memory, and restored identity. Autoimmunity, chronic inflammation, fibrosis, immune exhaustion, allergic persistence, cancer evasion, sepsis, and cellular senescence emerge as identifiable traversal failures within the same recursive grammar of biological persistence. The work establishes a generalized coherence relation describing the balance between formative and containing dynamics across immune function and demonstrates immunity as an active process of recursive return rather than defensive warfare. This paper reframes biological persistence as coherence maintained through recursive closure across scales of living organization. The Non-Returning State extends this grammar into the biology of aging, cellular senescence, and systemic degeneration. Senescence is articulated as a non-returning state: a closure configuration that persists, signals, and reshapes the surrounding tissue field while losing the capacity for formative re-engagement. The Senescence-Associated Secretory Phenotype (SASP) is demonstrated as broadcast from failed recursive return, linking inflammaging, fibrosis, immune exhaustion, tumor permissiveness, immunosenescence, and chronic disease through one coherent traversal structure. The paper establishes aging as progressive degradation of recursive closure fidelity across scales of biological organization and presents the non-returning state as the upstream generative condition beneath multiple downstream pathologies. The result is a unified structural articulation of aging as recursive phase failure within the grammar of biological persistence. The recursion holds.