Top panel: surface angular velocity evolution for Kepler-444 in the case of a fast rotator (Ω_ini = 18 × Ω_⊙, solid blue line), a medium rotator (Ω_ini = 5 × Ω_⊙, solid magenta line), and a slow rotator (Ω_ini = 3.2 × Ω_⊙, solid black line). The red dot represents the surface angular velocity of Kepler-444-A at the age of the system (11 Gyr). The red-dashed line shows the critical velocity limit. The vertical black-dotted line indicates the age of the system, while the horizontal red-dotted line shows the value of the surface rotation at the age of the system. Bottom panel: evolution of the EUV (solid lines) and X-ray luminosities (dashed lines) computed according to Eqs. (7) and (8) relative to the different rotational histories considered. The vertical black-dotted line indicates the age of the system.