  We study a dynamic $\Lambda$ model with varying gravitational constant $G$
under the Kaluza-Klein cosmology. Physical features and the limitations of the
present model have been explored and discussed. Solutions are found mostly in
accordance with the observed features of the accelerating universe.
Interestingly, signature flipping of the deceleration parameter is noticed and
the present age of the Universe is also attainable under certain stringent
conditions. We find that the time variation of gravitational constant is not
permitted without vintage $\Lambda$.
