John Jay, The Federalist No. 64

As the select assemblies for choosing the President, as well as the State legislatures who appoint the senators, will in general be composed of the most enlightened and respectable citizens, there is reason to presume that their attention and their votes will be directed to those men only who have become the most distinguished by their abilities and virtue, and in whom the people perceive just grounds for confidence. The Constitution manifests very particular attention to this object. By excluding men under thirty-five from the first office, and those under thirty from the second, it confines the electors to men of whom the people have had time to form a judgment, and with respect to whom they will not be liable to be deceived by those brilliant appearances of genius and patriotism, which, like transient meteors, sometimes mislead as well as dazzle. If the observation be well founded, that wise kings will always be served by able ministers, it is fair to argue, that as an assembly of select electors possess, in a greater degree than kings, the means of extensive and accurate information relative to men and characters, so will their appointments bear at least equal marks of discretion and discernment.