1911 Census of England and Wales, General Report with Appendices, Table 129: " Wales and Monmouthshire. - Proportions per 1,000 of Males and of Females at each Age-Group speaking English only, Welsh only, and both English and Welsh, 1911".

AGES. Proportion per 1,000 persons of each sex at the several age-groups.
Speaking
English only.
Speaking
Welsh only.
Speaking both
English and Welsh.
Other Languages
or no statement.
Males. Females. Males. Females. Males. Females. Males. Females.
Total 3 years and upwards 545 529 81 88 346 355 28 28
3 and under 5 591 588 132 128 171 177 106 107
5      "      10 592 588 100 95 260 269 48 48
10      "      15 571 568 64 57 332 342 33 33
15      "      25 576 564 49 43 349 372 26 21
25      "      45 551 532 59 65 372 384 18 19
45      "      65 470 443 115 137 402 405 13 15
65 and upwards 404 372 195 247 390 368 11 13