The pie charts represent a different age groups of the populations in countries like Yemen and Italy. We can see that the first chart shows 2000 year when second is projection for 2050.
According to all charts, it is noticeable that charts has roughly similar ratios with some differences, but overall, the main age group is steadily the same in both countries.
Speaking of 2000 year, In Yemen there is a proportion that almost half to half with the age group of 0-14- and 15-59-years old people, what accounts for 46,30% and 50,10% respectively. The smallest group is 60+ years that counts only 3,60%. Likewise, in Italy average and smallest group switch places and here 60+ population numbers 24,10% while 0-14 years old counts 14,30%.
In 2050, it is predicted that while the most common group population is still 15-59 years everywhere in Italy 60+ group is almost catching up this group, with approximately 4% difference. In Yemen 0-14 group is declining population. The least common group in both countries is stabilized with almost the same percentage.