Nonequilibrium magnetic properties of single-crystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mn>0.7</mml:mn></mml:msub><mml:msub><mml:mi>Ca</mml:mi><mml:mn>0.3</mml:mn></mml:msub><mml:msub><mml:mi>CoO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Magnetic and electric properties of a single crystal of ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{CoO}}_{3}$ have been experimentally studied. The system attains a ferromagnetic spontaneous moment below 170 K and exhibits a reentrant spin-glass phase below 100 K. In the ordered and the reentrant phases, the low-field magnetic properties are strongly direction dependent, showing considerably higher magnetization values perpendicular than parallel to the $c$ axis. Magnetic relaxation experiments show that both the ferromagnetic and the reentrant spin-glass phases are nonequilibrium states, where the system exhibits magnetic aging characteristic of spin glasses and disordered and frustrated ferromagnets.