We all know that as a woman ages, her fertility declines. We’ve be told that a young woman (around age 25) has approximately a 25% chance of conceiving each cycle and that that rate decreases as she ages.
By the age of 35, a woman has only a 10% chance of conceiving each cycle. As you can imagine, a woman over the age of 40 faces even longer odds.
For people who learn better from pictures, Cotton’s graph allows us to view the relative effect of age on fertility.
The most obvious observation is how the fertility lines flatten out over time, signalling a decrease in fertility.