Caporegime
You don't get a vote based on your tax contributions, you get a vote based on the fact you're a citizen of the United Kingdom, regardless of age
I know, I'm not sure what relevance that has to this discussion. My point is that giving a large slice of voting power to people who are about to leave the workforce, are more likely to be out of touch with the reality of modern life and going to prioritise a section of society that is no longer putting into the countries coffers is bad.
Its this sort of power that leads to the Tories being in power for years despite utterly shambolic running of the country, Brexit happening and all parties promising things that benefit the retired over the next generation.