Al,
I fully agree that all who are able should vote - our parents and grandparents fought hard for the right for all to vote and for each vote to have equal weight; one person, one vote. I can also see the counter point and it is something you have commented upon frequently, Politicians do not always work in the interests of the electorate and it is true that the majority of parliaments and representatives do not reflect society as a whole - they are usually older folk!
This is why young people don’t vote, and it is common around the world, they do not believe that politicians represent them or their views/interests - take the focus on climate change by extinction rebellion as one example.
When younger people are elected to office it is usually with a chorus of calls indicating their lack of experience, of real world issues and of life skills - usually only gained by living longer not by being more intelligent!
Politicians are not representatives FOR the people, they are representatives OF the people, take a look at your parliament (or mine) and it is clear that our current raft of politicians are representative of a smaller section of the people - hence the disconnect with younger voters and the reasons why they don’t come out to vote.