The given line graph depicts the percentage of people of different age groups who attended cinema from 1984 to 2003.(paraphrasing the question)
Overall(Signpost phrase to indicate that this paragraph is about the overview), cinema lovers(lexical resource for attendance) grew in all age groups in the given period of time with(connective word) a clear indication that younger age groups had a higher percentage of cinema visitors than(comparative language) the older age groups.
Body Paragraph 1
Diving deep(Signpost phrase for body paragraph), from 1984 to 2003, cinema attendance rose considerably across all age groups, but the increase was the greatest for the 15-24 age groups, which rose from about 18% in 1984 to over 50% in 2003. Though the figures fluctuated between 1992 and 1998, this age group still went to cinema more than any other age group.
Body Paragraph 2
There was also a substantial rise in cinema attendance among people in their late 30s. In this case the figures increased over this period from about 2% to over 10%. Cinema attendance of 7-14 and 25-35 year-olds followed a similar pattern from 1984 to about 2002, which was characterized by some fluctuations throughout. However, from 2002 the trends differed in that 7-14 year olds went to the cinema less frequently while cinema attendance of the 25-44 year olds was on the increase.