While true, check out this demographic map for the US: (https://en.wikipedia.org/wiki/Demographics_of_the_United_Sta...). The majority of people are over the age of 30, and most of them live in owner-occupied homes. In fact, 66% of all Americans live in owner-occupied homes. I imagine these statistics look similar or even worse in the UK.

There is a real demographic advantage for the elderly, and those who own homes, even if we ignore the propensity for young people to fail to vote.