I'd be interested to know the answer to the questions.
The only person I can think of who may be the longest serving
member is Quizmonster who was an important contributor to AB
until he fell out over his postings to the Listener Threads.
A pity as he was a true crossword genius - in the real sense.
I have been a 'worthy' member since February 2014 and have a 1yr Service Badge.
However, it appears that the system for issuing Badges is a complete failure. If it were working correctly I would have a Silver for my Internet researched Best Answers in the Technology section of AB. ☺☺☺