Sorry to drag this topic up again but I been waiting for my posting rights to be activated for the last 4 weeks. Anyway in reply to "Tom & Gerry" yes you weren't alone in getting a nice surprise when renewing online. I got a senior concession despite being short of 65 by 18 months.
The only reason I can think of is that I originally received a concession when I renewed at the age of 60 for the 2009/2010 season and for the 2010/2011 season. Last season they moved the concession to 65 and I didn't get my concession...I did however send a written complaint. Maybe it pays to complain.