Your question (or the insinuation from your OP's media click bait) is flawed and disingenuously presented.
e.g. to play devils advocate, If it's about those that work and contribute the most having the most say.. In 2019, the age at which you where more likely to vote conservative than labour was 39.. If you then look at the amount of 'tax' paid on average , 40-60 years olds contribute 4 times more than 20-24 year olds, 40-60 year old males contribute 5-6 times the tax compared to 20-24 year old males.. So really people under 40 shouldn't vote either??
The 'facts' are that you can present the data any which way you want to favour your preferred outcome, I mean being retired is no less worthy than having almost no life experience although I would say those saying people have no right to complain when they can't be bothered to turn up are actually correct..
The simple truth is, as stats show, it's about being 'fair'.. if younger people got off their asses and voted they'd have plenty of say, and retirees have every right to also vote, this makes government look after both ends of the Spectrum, a Spectrum that is funded by those in the middle..