In philosophy, substance means, approximately, that element of an object without which it would not exist. In the millennia-old Aristotelian tradition[?], as well as early modern[?] traditions that follow it, substances are treated as having attributes[?] and modes[?].
... age or older. The median age is 35 years. For every 100 females there are 95.1 males. For every 100 females age 18 and over, there are 89.3 males.
The median income ...