"Flare activity" refers to a sudden and intense increase in a specific event or phenomenon. It often implies an upsurge or burst of energy, intensity, or activity. Full definition
The Sun goes through cycles of solar flare activity about every 11 years. (myscizzle.com)
Thus we have three stars and possible planets at markedly different stages of development, giving us the ability to take a deeper look into flare activity on M - dwarfs as they age, and to assess flare effects on planetary habitability, assuming Barnard's Star and Ross 154 do have planets. (reddots.space)
We'd like to know how stars like this age, considering that young M - dwarfs can show strong flare activity. (reddots.space)