The sample of 37485 suspected OB stars selected by Gontcharov (2008AstL...34....7G) from the Tycho-2 catalogue has been cleaned of the stars that are not of spectral types OV-A0V. For this purpose, the apparent magnitude VT from Tycho-2, the absolute magnitude MVT calibrated as a function of the dereddened color index (BT-VT)0, the interstellar extinction AVT calculated from the 3D analytical model by Gontcharov (2009AstL...35..780G) as a function of the Galactic coordinates, and the photometric distance Rph calculated as a function of VT, M_VT_, and A_VT_ have been reconciled in an iterative process. The 20514 stars that passed the iterations have (BT-VT)_0_<0 and M_VT_>-5 and are considered as a sample of OV-A0V stars complete within 350 pc of the Sun. Based on the theoretical relation between the dereddened color and age of the stars, the derived sample has been divided into three subsamples: (BT-VT)_0_< -0.2, -0.2<(BT-VT)_0_< -0.1, and -0.1<(BT-VT)_0_<0, younger than 100, 100-200, and 200-400 Myr, respectively. The spatial distribution of all 20514 stars and the kinematics analyzed for more than 1500 stars with radial velocities from the PCRV and RAVE catalogues are different for the subsamples, showing smooth rotations, shears, and deformations of the layer of gas producing stars with the formation of the Gould Belt, the Great Tunnel, the Local Bubble, and other structures within the last 200 Myr. The detected temporal variations of the velocity dispersions, solar motion components, Ogorodnikov-Milne model parameters, and Oort constants are significant, agree with the results of other authors, and show that it is meaningless to calculate the kinematic parameters for samples of stars with uncertain ages or with a wide range of ages.