Youth cannot imagine romance apart from youth. That is why the roles of the heroes and heroines of plays are given by the managers to the most youthful actors they can find among the competent. Both middle-aged people and young people enjoy a play about young lovers; but only middle-aged people will tolerate a play about middle-aged lovers; young people will not come to see such a play, because, for them, middle-aged lovers are a joke--not a very funny one. Therefore, to bring both the middle-aged people and the young people into his house, the manager makes his romance as young as he can. Youth will indeed be served, and its profound instinct is to be not only scornfully amused but vaguely angered by middle-age romance.
The Magnificent Ambersons