Armrests in the Exit Rows and Buklhead (Row 6) on the A320 do not lift, due to the tray tables being in the armrest.

On the A319, Row 6 (Bulkhead) to not lift. Also, 12A and 12F have their tray tables in the armrest, so those do not lift either.
Seats 12BCDE have normal trays in front, so I believe the inner armrest does raise (I always sit in Row 6 on A319s, so never experienced the Exit Row on them).

[This message has been edited by SEA_Tigger (edited Nov 18, 2003).]