This paper proposes a new estimation model to capture the complex effect of age on organization survival. Testing various theoretical propositions on organizational mortality, we study the survival of French agricultural cooperatives in comparison with other firms with which they compete. The relationship between age and mortality in organizations is analyzed using a Bayesian Generalized discrete-time semi-parametric hazard model with correlated random effects, incorporating unobserved heterogeneity and isolating the various effects of time. This analysis emphasizes the specificity of the temporal dynamics of cooperatives in relation to their special role in agriculture.