  The issue of gauge unification in the (non-supersymmetric) Standard Model is
reinvestigated. It is found that with just an additional fourth generation of
quarks and leptons, $SU(3) \otimes SU(2) \otimes U(1)$ gauge couplings converge
to a common point $\sim 2.65 \times 10^{15}$ GeV ($\tau_p \sim 10^{34 \pm 1}$
years) provided the Higgs boson has a mass of at least 210 GeV. The presence of
ultraviolet fixed points for the Yukawa and Higgs quartic couplings is found to
be the origin of such unification.
