The line graph presents a longitudinal examination of birth rate trends across six female age cohorts in the UK between 1973 and 2008.
Overall, while fertility rates among women aged 30–39 exhibited a sustained upward trajectory, all other demographic groups experienced a discernible decline. Despite periodic fluctuations, the 25–29 age cohort consistently registered the highest birth rates, whereas those aged 40 and over maintained the lowest figures throughout the observed period.
In 1973, women aged 25–29 recorded the highest fertility rate, at approximately 140 births per 1,000 women, closely followed by the 20–24 demographic, which registered nearly 130 births. By contrast, significantly lower figures were observed among those under 20 and those aged 30–34, at approximately 60 and 70 births, respectively. Meanwhile, the 35–39 group exhibited a considerably lower rate of 40 births, albeit still double that of the 40+ category.
By 2008, the birth rate for 25–29-year-olds had declined to 120 births per 1,000 women, while that of the 20–24 cohort contracted markedly to just above 90. Conversely, birth rates among women aged 30–39 demonstrated sustained growth, culminating at nearly 90 (30–34) and 70 (35–39).