A cute story for kids about an old tractor, but the real target audience is the mature adult.
I listened to the audiobook version so missed the illustrations, but the descriptive language was plenty sufficient to evoke deep nostalgia for playing on the retired farm equipment on my uncle's kibbutz on my first visit to Israel as a small child.
Even more poignant is the question of seeking meaning in life as an elderly tractor (or person), who has been rejected in favour of the new model. Can one still be a productive member of society once no longer competitive in the workplace? Do we surrender to being put out to pasture, seek an alternate form of contribution, or content ourselves with reminiscence of a glorious past.
That's a LOT to pack into 7 minutes.