I first joined MN 12 years ago (have had maybe 4 accounts since due to changing e-mail addresses etc).
Back then, did DS12 mean my 12 year old son or my 12th born son? I'm absolutely convinced it was the latter.
Somehow over the years, and I'm not sure how, the number seems to have morphed into the age.
Just returning to MN after a gap & it's really noticeable.