Philobiblon

… older mothers.

The Hon Georgiana Arstruther (1810-81) gave birth to her first child in January 1862 and twins in December of the same year, having been married at the age of 37.

from J. Lewis, “‘Tis a misfortune to be a great ladie’: Maternal mortality in the British aristocracy,” in The Journal of British Studies, Vol 37, No 1, Jan. 1998, p. 48.

The article argues that aristocratic women’s rate of maternal mortality matched the national average (although contemporaries thought that they were much more likely to die). It says that you might have expected, however, their rate to be lower, given their presumed better nutrition and living conditions; probably their earlier marriages were a factor.