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

Age determination of galactic B-type stars in double-lined eclipsing binaries