[Retracted] Data-Driven Winter Landscape Design and Pleasant Factor Analysis of Elderly Friendly Parks in Severe Cold Cities in Northeast China under the Background of Artificial Intelligence

Table 5

Development trend of the world’s elderly population.

years	Population (100 million)	Proportion over 65 (%)	Proportion of quantity over 60 (%)	Average life span	Population growth rate (%)
1950	25.15	5.1	8.04	46.0	17.7
1960	36.69	5.4	8.34	54.8	20.8
1970	44.49	5.9	8.49	58.0	17.2
1980	52.46	6.2	9.25	9.25	16.2
1990	56.78	6.5	9.51	62.6	15.7
2000	61.23	6.8	9.93	64.9	12.7
2020	82.05	8.7	14.27	70.5	9.5