I'm member in three groups (one of them is a testing group for D&D with a completely different magic system).
The oldest group was founded in summer 1991 (so all members are AD&D veterans):
Bastian (27): playing a half-elf ftr/clr of Kelemvor (4/11). Makes his PhD in biochemistry.
Björn (28): playing a human pal/clr of Helm (13/1). Married, medical doctor.
Frank (27): playing an elf wiz (15). IT professional.
Marcus (27): current DM, makes a tough RttToeE-campaign for this group. His half-elf rgr/ftr (12/2) was recently killed. Financial professional.
Me, Stephan (28): playing a human drd of Mielikki (14). Hoping to start my PhD in geology soon.
It's a pretty good group, we're having lots of fun (despite some rule discussions, but you never stop learning).
Second group, about 5 (?) years old, some members have experience in other RPG systems (DSA, Midgard...), others started with AD&D:
Anja (32?): plays a human female drd (11). Married, hospital employee. Came to the group about two years ago.
Bastian (see above): plays a human drd/wiz (1/14).
Christoph (27? heck, my memory): plays a human female sor/rog (3/2). His former PCs died by noble (stupid, unexpected?) sacrifice or failed save. Makes his PhD in biochemistry. RPG veteran.
Daniel (33): plays a half-elf pal/rgr/ftr of Torm (8/2/3). Married with Anja, geologist.
Heike (26): plays a halfling female rog/shd (13/1). Student of biology. RPG veteran.
Me: current (evil?) longterm DM, playing an elven rog/asn/wiz (10/3/1), who was recently killed in a stupid try to save the pal from a nightcrawler (!?! dice decision...

).
Sven (27? man, it's late): plays a satyr (former half-elf) ftr/clr of Tempus (1/12). Makes his PhD in chemistry.
This group tends to get into trouble at every opportunity and has needed a lot of time to respect nearly each PC or get along at least. Next step: working as a team...
Test group:
Anja: plays a female asimaar pal of Helm (5).
Daniel: plays a female brd/mage (4/2).
Dieter (32): plays a human rog/ftr (4/2). Started with RPG nearly a year ago, makes his PhD in biochemistry.
Heike: plays an elven rgr (1). Missed a lot of sessions in this group, so her rgr is still at level 1.
Me: current DM, playing a human bbn/drd of Mielikki (1/5).
These PCs have quickly learned to work as a team: strike hard and fast
