“The Picture in the House” (1921)
H. P. Lovecraft (writer).
Bicycle-based New England horror. Lovecraft’s first truly successful counter to his own retrophilic impulse. Unfortunately, it is quite possible to read the character of the old man as corrupted by an African influence, but aside from this, it’s one of the best stories treating gerontophobia, the creepiness of the old in the eyes of the young.
References here: “A View from a Hill” (1925).