Answer:
Hildegarde likes older men for their 'refined' personality.
Step-by-step explanation:
"Young boys are so idi0tic. They tell me how much champagne they drink at college, and how much money they lose playing cards. Men of your age know how to appreciate women. […] You're just the romantic age […], fifty. Twenty-five is too wordly-wise; thirty is apt to be pale from overwork; forty is the age of long stories that take a whole cigar to tell; sixty is – oh, sixty is too near 70; but fifty is the mellow age. I love fifty. […] I've always said […] that I'd rather marry a man of fifty and be taken care of than many a man of thirty and take care of him." (1.6.15-18)