The information requested falls within the responsibility of the UK Statistics Authority. I have asked the authority to reply.
Letter from Karen Dunnell, dated June 2009:
As National Statistician, I have been asked to reply to your question asking what estimate has been made of the average age of the population in each district in each year since 1997. (281982)
Table 1 shows the median age of the resident population in each local authority district in the UK for the years 1997 to 2007. These figures are based on the mid-year population estimates and mid-2007 is the latest year for which data are available.
A copy of the table will be placed in the Library of the House.