12.2% (56 years old - member for 6 years, 10 months)
Let’s see, I signed up in 1999. That’s eight years out of 35, round it to 8/36ths. That simplifies to 2/9ths. That would be 22.2% or thereabouts.
Good god. What have I done to myself?
8.3%, but I’m working towards double-digits, baby!
19.51219512195121951219512195122. Roughly.
I have spent just over a third of my life as a member of the SDMB. 103 months out of 306 total.
I… win?
59/310 or 19%
27.0% 79/293.
2710 days / 9153 days, so…
A whopping 29.6%. I think that makes me ranked second so far.
15.9%. Plus a few extra decimals …
About 14%, but for 60% of my life the Internet didn’t exist. Ya know, I got a lot more reading done back then. 
11.34%
I have a whopping 4.4%, which means that I have to spend around 10 years here to get past 20%, which reminds me of the the Disney movie “Hercules”; can I go the distance?
Interesting question indeed. Me = 23.1%.
21.5% 58/270
Hmm. Not the number I’d thought it would be. I thought it would be higher. I’ve been here since my senior year in high school, but I think I lurked from junior year onward.
22.03%
Not counting the months of lurking I did prior to joining up, 14.588%
Oops, missed where I was supposed to count by months and not years. 11.25%, not 10%.
Now that you have my updated information, you may breathe a sigh of relief and get on with your life.
20.9%
5.65%
Judging by my join date, that makes me 115 years old!
Holy crap.
37.3%.
Checks math.
Yep. 37.3%