The present study makes use of the unprecedented capability of the Gaia mission to obtain the stellar parameters such as distance , age , and mass of HAeBe stars . The accuracy of Gaia DR2 astrometry is demonstrated from the comparison of the Gaia DR2 distances of 131 HAeBe stars with the previously estimated values from the literature . This is one of the initial studies to estimate the age and mass of a confirmed sample of HAeBe stars using both the photometry and distance from the Gaia mission . Mass accretion rates are calculated from H \alpha line flux measurements of 106 HAeBe stars . Since we used distances and the stellar masses derived from the Gaia DR2 data in the calculation of mass accretion rate , our estimates are more accurate than previous studies . The mass accretion rate is found to decay exponentially with age , from which we estimated a disk dissipation timescale of 1.9 \pm 0.1 Myr . Mass accretion rate and stellar mass exhibits a power law relation of the form , \dot { M } _ { acc } \propto M _ { * } ^ { 2.8 \pm 0.2 } . From the distinct distribution in the values of the infrared spectral index , n _ { 2 - 4.6 } , we suggest the possibility of difference in the disk structure between Herbig Be and Herbig Ae stars .