To put it brutally COVID culled the sickest and frailest. Those who would probably have died within the year anyway. This as much as new treatments accounts for the drop in deaths and hospitalisation in the second wave.
Mortality rates by age will be based on these deaths. I suspect that, while the death rate does rise with age, the death rate for older people without underlying medical conditions who are fit and healthy is much lower.
Being quizzed by chemist's assistant in Boots.
To think that London, or anywhere else for that matter, does not belong to any one demographic