A pixel circuit includes a data written-in sub-circuit, a driving sub-circuit, a threshold compensation sub-circuit, a light-emitting element, a sensing sub-circuit and a first light-emission control sub-circuit. The driving sub-circuit is configured to control a driving current for driving the light-emitting element to emit light. The data written-in sub-circuit writes threshold compensation information into a second terminal of the driving sub-circuit at a compensation stage. The threshold compensation sub-circuit stores a data signal and adjusts a voltage at the second terminal of the driving sub-circuit in a coupled manner. The sensing sub-circuit writes a sensing voltage into a first terminal and the second terminal of the driving sub-circuit at a display process, senses aging information of the light-emitting element during an aging detection process and transmits the aging information to the aging detection device.