This would do the trick if you were still hell-bent that the universe had to have Omega = 1.0000, but if you relax this requirement and say that there isn't really that much Dark Matter in the universe, then you can easily accommodate the expansion rate/age with the age of the oldest stars in globulars, for a low-Omega universe near Omega = 0.1 In other words, there may still be enough Dark Matter to make galaxies sensible systems, dynamically, but that the combination of Dark+Luminous matter is still Omega = 0.1 or 0.2 tops. This would be consistent with the primordial ( baryonic ) element abundances, and you would not need a cosmological constant at all. I favor this simple solution observationally, but this means that since Omega would not equal 1.000, that the inflationary Big Bang cosmology is no longer valid and that would be a shame since it seems to provide explanations for other phenomena in observational cosmology such as why the cosmic background radiation is so uniform at scales greater than the horizon scale.