FranP
Never had a mortgage; never had to live alone, pay for rent, fuel or food, possibly not for clothes except fashion items.
Never had to decide if they can ever afford to have children.
Nor had I when I first voted at 19, save handing over some of my wage to my mother as housekeeping.
I worked from age 16 (15 if you count holiday jobs) married at 20; the first time I had had my own home and paid a mortgage. It made no difference to my political views which are no different 50 years later.
Nowaday, many young adults are still living with their parents well into their 30s. By your argument, they shouldn't have a vote either.