Offramp wrote:

Why do old people only want to use the front doors for both?


What is your evidence for that statement? I've not kept score but my
perception is that the behaviour is shown most often by people with one
or both of 2 characteristics: (a) people new to London* and (b) selfish
gits; and they seem to me to have a lower age than the general bus
population.

There are of course some old people who do exit at the front but that is
not surprising to me as (a) they may have spent very many years on buses
where that was the only option and (b) if seated at the front they find
that by far the easier and quicker route when using the middle doors so
often means negotiating buggies, shopping trollies and standing
passengers whose attention is 100% on their phones.

--
Robin
reply to address is (meant to be) valid