To Tell the Age of Any Person

This chart appears in The Handy Cyclopedia of Things Worth Knowing written by Joseph Trienens in 1910. I haven’t tried it yet as this book is being read to me at work from Librivox.org. The chart only goes up to 63, but considering that the average life expectancy worldwide was 33 at that time, it probably covered most people. I find it wild that, just over a century ago, half of the world’s population could not expect to reach even the age of 17 mentioned here.

Hand this table to a young lady, and request her to tell you in which column or columns her age is contained, and add together the figures at the top of the columns in which her age is found, and you have the secret. Thus, suppose her age to be seventeen, you will find that number in the A and E columns: add the first figures of these two columns.

A             B             C             D             E              F
1              2              4             8           16            32
3              3              5             9           17            33
5              6              6           10           18            34
7              7              7           11           19            35
9             10           12           12            20           36
11           11           13           13            21           37
13           14           14           14            22           38
15           15           15           15            23           39
17           18           20           24            24           40
19           19           21           25            25           41
21           22           22           26            26           41
23           23           23           27            27           43
25           26           28           28            28           44
27           27           29           29            29           45
29           30           30           30            30           46
31           31           31           31            31           47
33           34           36           40            48           48
35           35           37           41            49           49
37           38           38           42            50           50
39           39           39           43            51           51
41           42           44           44            52           52
43           43           45           45            53           53
45           46           46           46            54           54
47           47           47           47            55           55
49           50           52           56            56           56
51           51           53           57            57           57
53           54           54           58            58           58
55           55           55           59            59           59
57           58           60           60            60           60
59           59           61           61            61           61
61           62           62           62            62           62
63           63           63           63            63           63

 

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