I am sneaking this one in here because IIRC, you had mentioned something about your preference for over 30 year old SBs. While one would be too foolish to make a blanket statement, my sentiments on this matter are purely based on my own expriences with dabbling on SA, on and off, for almost 4 years (sporadically and part time):
To cut through the chase, my "kill rate" with under 30's, specifically with under 25s, as compared to over 30's has been off the chart! Why? Multitude of reasons but in general (there I go making a generalization!) I found that the over 30's being more experienced are more averse to BS and unless very desperate (those to be avoided) they tend to take their time and are a bit more selective. The silver lining being that some of them who are genuine are more open toward letting matters organically develop into a BF/GF type of relationship whence trust has been established.
At this juncture and merry-go-round, I did not do too well with the 31-35 YO SBs who I had contacted. I found those to be very sensitive to the slightest of red flags (or what they deemed to be red flags) specially if they got the whiff that an SD is none committal in terms of exclusivity and is deemed as a "serial SD". I had this one very promising and educated 33 YO potential SB who really showered me with praised and platitudes in terms of my writing style and mannerism (we never met) but when I made an excuse to bump her from the first date to score with my Unicorn (always take the sure thing, duh!), despite my very plausible excuse (well, so I had thought) she must have sniffed the BS and then NEVER responded to my messages after she sent me a short "it is understandable" txt msg. Win some, lose some!
The younger ones whether more gullible or less broken winged and perhaps both, are more open to unadulterated fun and propositions but the very young ones can be extremely flaky. Case in point, unless you are very self-conscious and somehow very morally averse to 25-30+ years of age gap, you are missing out on some superb POT SB material available out there. By the same token, I (or someone of my mindset and ilk) may also be missing out on some superb POT SB material in that 30's to low 40's age range, but I draw from my past experiences so not to waste precious time. In general, I never do well with older SBs and Asian SBs of any age. I just don't do well with Asian women, PERIOD!