各位大神我是一个新手，有这么一组数据，可以帮我用r语言决策树，在人口老龄化这方面分析一下这组数据吗？这只是数据的一部分，整个太大了，我就没有上传。
| Single Year Age Groups for Custom Region - United States | | | | |
| Country | Year | Age | Both Sexes Population | Male Population | Female Population | Percent Both Sexes | Percent Male | Percent Female | Sex Ratio |
| United States | 2000 | Total | 282162411 | 138443407 | 143719004 | 100 | 100 | 100 | 96.3 |
| United States | 2000 | 0 | 3855956 | 1974134 | 1881822 | 1.4 | 1.4 | 1.3 | 104.9 |
| United States | 2000 | 1 | 3798691 | 1942607 | 1856084 | 1.3 | 1.4 | 1.3 | 104.7 |
| United States | 2000 | 2 | 3800144 | 1944116 | 1856028 | 1.3 | 1.4 | 1.3 | 104.7 |
| United States | 2000 | 3 | 3821118 | 1952707 | 1868411 | 1.4 | 1.4 | 1.3 | 104.5 |
| United States | 2000 | 4 | 3902384 | 1997055 | 1905329 | 1.4 | 1.4 | 1.3 | 104.8 |
| United States | 2000 | 5 | 3967834 | 2032440 | 1935394 | 1.4 | 1.5 | 1.3 | 105 |
| United States | 2000 | 6 | 4004335 | 2050345 | 1953990 | 1.4 | 1.5 | 1.4 | 104.9 |
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