Measure K might push legal envelope

EDITOR,
Do you think Measure K, parcel tax for schools, would have passed if seniors had to pay the tax burden? Is it legal to omit a group of voters from paying the tax but have them be included in the vote? Although our schools may need more funding, I have not heard of carving out a special interest group from the tax consequences of a public measure.
Pam Call, Scotts Valley