The aging No. 1 reactor of the Takahama nuclear power plant in central Japan was given the all clear by the nuclear regulator Wednesday to continue operations, making it the first reactor in the country to get approval to operate beyond 50 years. The Nuclear Regulation Authority gave the green light to Kansai Electric Power Co.’s management plan for the next 10 years for the reactor, which marks its 50th anniversary next month, as the government considers nuclear power vital in the resource-poor country’s energy mix. The regulation authority confirmed the operator’s evaluation, which states th…