If I change my age to 12, do airlines have to sell my half price seats, but it becomes illegal for me to buy alcohol and drive? Would it become child pornogrograhy to distribute naked photos of me? Do older photos become retroactively illegal?
If I become legally older, can I start withdrawing a pension?
Maybe we should disconnect age from the legal system, and say no company can ask. But if we did that then there wouldn't be any need to adjust your legal age anyway.