Only if the trend between women getting more liberal and men getting more conservative cancel out. If you have a graph like South Korea where young women vote moderately more liberal, but young men become drastically more conservative, then it still results in an overall shift towards conservative values.
Does it, though? If I lean a little bit left I'm going to vote left, whereas if I lean a lot left then... I'm still going to vote left (or vice versa). Granted, I might vote for a more fringe party then further I lean, but I don't think a greater divide will reflect in the number of votes particularly.
Yes, but the way i read the chart it doesn't differentiate between degrees of ideology; Just a binary "what percentage of the age group votes liberal vs conservative". So at 0 there is a 50/50 there are equally as many liberals as conservatives, but it doesn't provide any information how strong this ideological views are.