The only time a women wishes she was a year older is when she's expecting a baby.

The quip plays on a common cultural assumption that many women prefer not to be perceived as “older,” then flips it by pointing to pregnancy as an exception. When expecting a baby, being “a year older” implies being one year closer to the end of pregnancy—an expression of impatience, discomfort, and anticipation for the child’s arrival. The humor depends on compressing time: age becomes a metaphor for wanting the calendar to move faster. It also reflects how pregnancy can reorder priorities, making social anxieties about age temporarily irrelevant compared with the immediate physical and emotional realities of gestation.