@SW-User If a government legislates for military conscription (as our Conservative Party proposed), this will clearly affect the interests of younger people, as would any laws relating to higher education, rental property, the environment, etc. If a government makes a mid to longer term budgetary commitment, such as linking pensions to inflation, it is the younger generation who will foot most of the bill across their lifetime, even though they may not be paying tax at the current time. In a similar way, it would not be correct to exclude older or unemployed people from the franchise on the basis of their current day tax contribution.