GLA 2012 round ward-level population projections by 5yr age groups using 2009 SHLAA-based housing trajectories. These differ from the standard ward projections in that development data is used to distribute population at ward level, but the overall borough-level projection is constrained to the 2012 round Trend-based projection found here. Ward projections consistent with the 2012 round SHLAA-based borough projections can be found here.
There is a custom age range tool available for this data.
For links to the GLA's full range of demographic projections click here.