That's anyone that purchases anything except a few VAT exempt products.

Anybody who earns enough money pays tax, there is actually no age limit. If you have a part time job paying more than £12.5k a year you'll pay income tax. If you are paid more than £9k your employer has to start paying National Insurance.

If your definition is people who pay cash tax then we need to stop most pensioners, disabled people, people on benefits, stay at home partners (mostly women), part time workers, carers, and probably others I've missed from voting too then?

Those who will be affected by a decision should have a vote. It's not just about taxes, you know. And yes, that implies that men shouldn't vote about women's healthcare, for example.

Cool, then everyone gets to vote. Immigrants (even undocumented), refugees, children...

Them existing and participating in the economy generates taxes, even if they don't file them.

I'll tell you something for free. Your vote doesn't matter. The same arseholes get into power, do fuck all, and leave under sleaze and scandal.

Save your time.... Go to the pub instead.