Gapminder population dataset (open-numbers/ddf--gapminder--population) - 2010 age group aggregation
Source repository: https://raw.githubusercontent.com/open-numbers/ddf--gapminder--population/master/
Requested groups: 0-9, 10-19, 20-29 (inclusive); summed from single-year ages.

ENTITY: World (world) | source file: ddf--datapoints--population--by--global--year--age.csv
age,population (2010) for ages 0-29:
0,138811911
1,136286342
2,133938060
3,131635544
4,129719619
5,128232837
6,126973805
7,125914770
8,125283943
9,125089753
10,123973637
11,122537804
12,122127852
13,121998660
14,122048493
15,121946694
16,121811585
17,122055966
18,122872031
19,125721067
20,126990118
21,125032458
22,123956598
23,122588346
24,119779610
25,116949317
26,114260980
27,113153909
28,111450795
29,108352375
SUM_0_9,1301886584
SUM_10_19,1227093789
SUM_20_29,1182514506

ENTITY: Afghanistan (afg) | source file: ddf--datapoints--population--by--country--age--year/ddf--datapoints--population--by--country-afg--age--year.csv
age,population (2010) for ages 0-29:
0,1106040
1,1057862
2,1022480
3,994488
4,975173
5,956048
6,937154
7,919202
8,898592
9,874421
10,848956
11,821449
12,793764
13,766091
14,736820
15,706590
16,674900
17,641189
18,606592
19,573144
20,543134
21,516273
22,490283
23,465765
24,441397
25,416824
26,396588
27,381248
28,368705
29,358166
SUM_0_9,9741460
SUM_10_19,7169495
SUM_20_29,4378383

ENTITY: South Africa (zaf) | source file: ddf--datapoints--population--by--country--age--year/ddf--datapoints--population--by--country-zaf--age--year.csv
age,population (2010) for ages 0-29:
0,1133910
1,1157745
2,1139290
3,1089334
4,1062966
5,1024242
6,979924
7,939598
8,926385
9,932063
10,952499
11,974941
12,991377
13,1025486
14,1061066
15,1057286
16,1066448
17,1092940
18,1103772
19,1111177
20,1123051
21,1147300
22,1161821
23,1168773
24,1166346
25,1147864
26,1110543
27,1054959
28,981601
29,915198
SUM_0_9,10385457
SUM_10_19,10436992
SUM_20_29,10977456

COMPACT_SUMMARY (population counts)
entity,age_group,population_2010
World,0-9,1301886584
World,10-19,1227093789
World,20-29,1182514506
Afghanistan,0-9,9741460
Afghanistan,10-19,7169495
Afghanistan,20-29,4378383
South Africa,0-9,10385457
South Africa,10-19,10436992
South Africa,20-29,10977456