Up to (and including) 2016, out of a workforce of 3700-3800, only twenty six pilots will hit 65.
The retirement age was extended to 65 on 1/10/2006. Therefore the oldest pilot in BA is currently just approaching his/her 62nd birthday (anyone older would have been forced to retire at 55). The relatively small number of retirements in 2016 is because there are only three months left in which people attain 65. In subsequent years the normal retirement rate will resume.