Brain mitochondrial oxygen consumption and coenzyme Q content decreased in aged mice.
Early-onset motor impairment occurred in normal aging mice.
Ser129-phosphorylated α-synuclein increased in the motor cortex of aged mice.
Levels of vesicular glutamate transporter 1 decreased in the motor cortex.
Coenzyme Q restored motor function and α-synuclein accumulation in aged mice.