Possible rotational evolution tracks of Proxima Cen (1 Ω_⊙ = 2.67 × 10⁻⁶ rad s⁻¹). The black star shows the modern observed rotation rate of Proxima Cen, which corresponds to a rotation period of ~ 82.5 days. The triangles indicate the observational constraints on the 10th and 90th percentiles of the rotational distributions from Irwin et al. (2011). The purple line corresponds to the evolution track of a fast rotator, the green line shows the evolution track of a slow rotator. All values in between are also possible.