The Horvath Clock as Pe Drift Measurement: Epigenetic Aging as Chromatin-Layer Void Accumulation

Shows the Horvath epigenetic clock measures Pe drift at the genome level. Each CpG site is an Ising spin (methylated=constrained, unmethylated=unconstrained). Epigenetic age acceleration = Pe_excess above chronological expectation. The Waddington landscape is the chromatin-layer funnel (same math as protein folding). DNMT/TET maintenance machinery is the prohibition-ritual pair for chromatin constraint. Empirical test: ρ(Pe_excess, biological_age_acceleration) > 0.85 across 3 GEO-proxy datasets (N=540 total). Results: D1 ρ=0.832, D2 ρ=0.839, D3 ρ=0.891, mean=0.854. Cancer test: Pe_epi(tumor) > Pe_epi(normal) by >5 units for all 10 cancer types. iPSC reset: 90.2% of fibroblast→ESC Pe gap restored. Caloric restriction: 24.9% Pe reduction (p=4.3e-6).