  The kinematics of the young stellar association near the Sun TW Hya is
studied. Kinematic estimates of the age of this association were obtained in
two ways. The first method -- analysis of stellar trajectories integrated back
in time -- gave an estimate of the age $t=4.9\pm1.2$ Myr. The second was to
analyze the instantaneous velocities of stars and showed that there is a volume
expansion of the stellar system with an angular velocity coefficient
$K_{xyz}=103\pm12$ km s$^{-1}$ kpc$^{-1}$. Based on this effect, the time
interval that passed from the beginning of the expansion of the TW Hya
association to the present moment was found, $t=9.5\pm1.1$ Myr. The following
principal semi-axes of the residual velocity ellipsoid are determined:
$\sigma_{1,2,3}=(5.25,1.84,0.35)\pm(0.34,0.63,0.26)$ km s$^{-1}$.
