  We present the results of age determination for galactic B-type main sequence
stars which are components of double-lined eclipsing binaries. Only detached
systems are considered. We analyze 38 binary systems that meet such criteria.
The analysis is based on evolutionary computations and we consider that the age
is determined if there is a common value from the radius-age diagrams and the
agreement in the position of both components in the Hertzsprung-Russel diagram.
In some cases, to meet these two conditions, it was necessary to adjust the
value of the metallicity, Z or/and the parameter of overshooting from the
convective core, $\alpha_{ov}$. We determine the consistent age for 33 binaries
out of 38. Besides, we made an extensive computations and for each system we
give the range of $\alpha_{ov}$ and Z, for which the consistent solutions
exist. The age of the studied B-type main sequence stars ranges, as counted
from the Zero Age Main Sequence, from about 2.5 Myr to about 200 Myr.
