The table illustrates information about the UK population, including the percentage and number of 15 years old and 75 years old age groups, which changed in each five decades from 1911 to 2011.
It is clear that the total population significantly increased. While, the percentage of 15 years old teens slightly decreased but with high number, the reverse was true for people who aged 75. Moreover, the number of males aged 15 rose and that of females dropped. However, the proportion of men and women aged 75 climbed noticeably.
The total population rose steadily from 36.1 million in 1991 to 46.1 million and further to 56. in 2011. In terms of people aged 15, their proportion experienced a moderate decline, falling from 1.86% in 1911 to 1.48% in 1961, and also to 1.23% in the final year. Meanwhile, that of 75 years old rose overall, climbing from 0.23% in 1911 climbed to 0.55% in 1961, and reaching 0.70% in 2011.
Regardless of age, the figure for males showed upward trends throughout the period. In 1911, the number of 15-year-old boys stood at 334,200 after which slightly rose to 349,400 in 1961. This figure climbed by 5,000 over the next five decades. At the same time, the number of 75-years-old men grew sharply from 34,100 in 1911 to 160,200 in 1961. After five decades, the number of males in 75 age range surged to 181,300.
With regard to females, the number of girls aged 15 experienced a moderate decline from 335,700 in 1911 to 333,900 in 1961, whereas the figure for 75-year-old women rose dramatically from 47,400 to 254,900 over the same period. In 2011, the figure for girls at the age of 15 showed a marginal increase by 200 teen-girls. However, that for 75-year-olds represented a noticeable drop to 210,100.