There were quite a few older people targeted and arrested, some with violence against them from the police, at the Downing Street march and many other people who were arrested for just being there.
I am against what they are demonstrating about, but also against police beating protesters, who have committed no crime.
Progressive politics for me is about equality and justice. When you start defending the injustice, because it is against people you disagree with, in my opinion you are not defending justice or progressive politics, but entrenched political idealism.