I'm not sure that this is the right place for this question, if not please feel free to move it.
The wife of a friend commented that after flying RAFAir VC10 to Cyprus, BA 737-400 to Turkey, and a 'prop job' Ilyushin, she must have the honour of being flown in some of the oldest aircraft still carrying passengers in current service.
I'll grant her the 'mighty moonship 10' and the Ilyusin are getting on a bit, but does anyone know whether the BA fleet does consist of some of the longest serving 737 aircraft?