  We put a probabilistic framework on the Demographic Prisoner's Dilemma. In
this model, cooperating and defecting individuals are placed on a torus to move
and play prisoner's dilemma game, if they are on the same site. Each individual
accumulates its payoff into a quantity called wealth. If an individual becomes
wealthy enough, it can have an offspring. If its wealth becomes negative, it
disappears. In this framework we prove that if if the Sucker payoff is far
greater than the Reward then for all initial state almost surely all
cooperators will die. Moreover if the Temptation payoff (resp. Reward) are far
greater than the Punition (resp. Sucker payoff) then for all initial state with
positive probability cooperators and defectors live \emph{ad vitam eternam}. We
also set a Mean Field model on the demographic prisoner's dilemma and prove on
a linearized version of the Mean Field model that with weaker assumptions with
positive probability Cooperators live \emph{ad vitam eternam}.
