Voting Age Now 16 in Argentina

Today I saw and article that said 16 year olds in Argentina could now vote. At first, I thought it was a wonderful idea (mostly because I think I should be able to vote because I'm just a smart as any 20 year old I know. yes, I know many 20 year olds don't judge me)When I read closer to the article, I saw that this was only because the current president, President Cristina Fernandez de Kirchner, hopes to win the new election because of her large support from youth. It made sense,but the part I didn't like was she is hoping to get a constitution change so that she may get a third term. Well, who's to say it will only be 3 terms? What if she decides 'Hey, I like this job people like me, and I already got 3 terms, let's go for a fourth!' I mean, why change the rules already set in place? They work here, but I guess it's just different in Argentina. I wouldn't know, I never hear anything important going on there.