  A new dark energy model, named as ``agegraphic dark energy'', has been
proposed by one of us (R. G. Cai) in arXiv:0707.4049, based on the
K\'{a}rolyh\'{a}zy uncertainty relation, which arises from the quantum
mechanics together with general relativity. Then, in arXiv:0707.4052, it has
been extended by including the interaction between the agegraphic dark energy
and the pressureless (dark) matter. In this note, we investigate the agegraphic
dark energy models without and with interaction by means of statefinder
diagnostic and w-w' analysis.
