The line graph illustrates the percentage of the population classified as obese in a particular country from 1971 to 2005, categorized into four distinct age brackets.
Overall, it is evident that obesity rates increased across all age groups over the 34-year period. Additionally, individuals aged 45 to 64 consistently experienced the highest prevalence of obesity, while the youngest cohort (18-29) maintained the lowest rates throughout.
In 1971, the figures for the 45-64 and 65-74 demographics stood closely together at around 18%, before experiencing a dramatic upward trend. By 1999, the rate for the 65-74 group had climbed significantly to approximately 36% and remained relatively stable until 2005. Meanwhile, the percentage of obese individuals aged 45-64 grew even more rapidly; after reaching a temporary plateau, it had surged to a peak of just over 40% by the end of the period, marking the highest point on the graph.
A similar, though less pronounced, upward trajectory was observed in the remaining two groups. The 30-44 cohort commenced at 15% in 1971, remained unchanged until 1976, and then steadily rose to finish at roughly 35% in 2005. Conversely, the youngest demographic (18-29) started at a mere 8%. Despite remaining stagnant during the first five years, this figure grew substantially after 1976, ultimately tripling to peak at approximately 24% by the final year