My freshly graduated PhD student, Dr. Rachel Booth, has published the final paper from her PhD thesis together with me and a few coworkers. We have analysed how the magnetic activity of sun-like stars decays as they age, and have used a sample of stars that all have well-determined asteroseismic ages. We find that even at old stellar ages on the main sequence the spin down and therefore the decay of stellar activity continues.
For a read go here: “Chromospheric emission of solar-type stars with asteroseismic ages“, Booth, R. S.; Poppenhaeger, K.; Watson, C. A.; Silva Aguirre, V.; Stello, D.; Bruntt, H., Monthly Notices of the Royal Astronomical Society, Volume 491, Issue 1, p.455-467, 2020. (arXiv link).