城市人口金字塔

科普信息图,2:3竖版,标题《子午城 2025 年龄结构》。一张背靠背人口金字塔:左侧男性用冷蓝、右侧女性用暖玫红,按每5岁一档从0-4叠到85岁以上。25-39档最宽,越往顶越窄。两侧标注百分比刻度,中间是细体年龄标签。下方三条汇总:'中位年龄34''总人口180万''15岁以下18%'。纯白背景、扁平设计、克制的双色系。

An educational infographic, 2:3 portrait, titled 'Age Structure of Meridian City, 2025'. A back-to-back population pyramid: male bars in cool blue on the left, female bars in warm rose on the right, stacked in 5-year age bands from 0-4 up to 85+. Widest bars sit at 25-39, tapering at the top. Percentage axis labeled at each side, thin centered age labels. Below, three summary stats: 'Median age 34', 'Total 1.8M', 'Under 15: 18%'. Clean white background, flat design, restrained two-color palette.