Erythrocyte mean age: ⟨a⟩ = T_life/2; at T_life=120 d ⟨a⟩=60 d; Var(a) = T_life²/12 (uniform)

Sympy-exact symbolic witness of the erythrocyte-cohort-kinetics first and second moments under the steady-state uniform-age distribution. Setup: pdf f(a) = 1/T_life on [0, T_life] (from the framework above); T_life a positive symbol. …