  The discovery of the quasar, the APM 08279+5255 at z = 3.91 whose age is 2-3
Gyr has once again led to ``age crisis''. The noticeable fact about this object
is that it cannot be accommodated in a universe with $\Omega_m = 0.27$,
currently accepted value of matter density parameter and $\omega =
\mathrm{constant}$. In this work, we explore the concordance of various dark
energy parameterizations ($w(z)$ models) with the age estimates of the old high
redshift objects. It is alarming to note that the quasar cannot be accommodated
in any dark energy model even for $\Omega_m = 0.23$, which corresponds to $1
\sigma$ deviation below the best fit value provided by WMAP. There is a need to
look for alternative cosmologies or some other dark energy parameterizations
which allow the existence of the high redshift objects.

Astrophysics