Ancient Trees in Sakegawa
ancienttrees.app

Kosugi no Osugi (the Totoro Tree)
Japanese Cedar (Cryptomeria japonica). roughly 700 to 1,000+ years (sources disagree). Free, a village-designated natural monument with a public car park and marked path; Japanese Wikipedia notes the path from the car park to the tree is not snow-cleared in winter, implying open, unstaffed access the rest of the year