Several observational constraints are imposed on the interacting holographicmodel of Dark Energy and Dark Matter. First we use the age parameter today, asgiven by the WMAP results. Subsequently, we explained the reason why it ispossible, as recently observed, for an old quasar to be observed in earlystages of the universe. We discuss this question in terms of the evolution ofthe age parameter as well as in terms of the structure formation. Finally, wegive a detailed discussion of the constraints implied by the observed CMB low$\ell$ suppression. As a result, the interacting holographic model has beenproved to be robust and with reasonable bounds predicts a non vanishinginteraction of Dark Energy and Dark Matter.
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