Does a single mechanism of aging exit? Most scientists have their own pet theories about what is aging, but the lack of generally accepted theory is mind-blowing. Here we suggest an explanation: evolution works against unitary mechanism of aging because it equalizes ‘warranty period’ of different resilience systems. Therefore, we need life-extension methods that go beyond fighting specific aging mechanisms: such as using a combination of geroprotectors or repair-fixing bionanorobots controlled by AI.