The provided chart illustrates the proportion of Europeans in different age groups who visited gyms at least once a month from 1990 to 2010.
Overall, all age groups experienced a significant increase in gym memberships, with the 18-24-year-old cohort registering the most pronounced growth, even though it started at the second position. It is also important to note that the 35-44 and the oldest groups maintained their initial rankings while showing a noticeable increase.
Analyzing the first two younger categories, the figure for the 25-34-year-old group started at about 10%, which was the highest in 1990, and increased to approximately 30% over the next eight years before being surpassed by the youngest group, thus becoming the second highest at 50% in 2010. Meanwhile, the 18-24-year-old group began with under 10% in 1990 and continued to rise after surpassing the 25-34-year-old cohort, reaching a peak of about 60% in 2006; it then experienced a slight decline before growing back to the same high at the end of the observed period.
Turning to the two older groups, the oldest group began with around 5% in 1990 and initially remained stable in the first half of the period shown; then significantly increased to over 20% in 2010, albeit remaining the lowest ranking. Meanwhile, the 35-44-year-old cohort started at about 7% initially and experienced a fivefold growth over the twenty years.