Odd eligibility rules

One thing that puzzled me last year was Brendon Madigan's candidacy for the Comptrollership of Maryland. One would think he would start lower down the chain, say as a Delegate in the State legislature, before tackling a Statewide office. It turns out that the Comptrollership is just about the only office that the 18-year-old Madigan was eligible for! Both houses of the State legislature (called the General Assembly in Maryland) have minimum ages which are much higher (I just read where there is a Constitutional amendment being proposed that would lower those ages for both chambers to 21, which would still exclude someone Madigan's age), and all the other statewide offices have qualifications Madigan would not have met — age or otherwise. So it's strange. Madigan ran for the Comptrollership, it seems, because this was the only office in the whole State he qualified for!