I have no age limits that I know of but for me there is a peak age of a woman (And I am sorry if this offends anyone) that is between the ages of 27-32. I find that woman younger than that strike me more as girls that haven't fully matured into their beauty or matured into real life. Whereas, older than that is where age begins to show.

Of course, I have played with Dommes as young as 18 who were as good as anyone and the Dommes I currently have (and have had for many,many years) are much older than 32. So, I tend to completely ignore age and focus on how attractive (whether physically or by their style as a Domme. Honestly though, I haven't been attracted to many young Dommes these days because of findom and how that has corrupted their thinking as to what D/s actually is but it's less about age than improper attitude/approach for me.