1911 Census of England and Wales, General Report with Appendices, Table 128: " Wales and Monmouthshire. - Proportions per 1,000 persons at each Age-Group speaking English only, Welsh only, and both English and Welsh, 1911".

AGES. Proportion per 1,000 persons at each age-group.
Other Languages
or no statement.
Speaking
English only.
Speaking
Welsh only.
Speaking both
English and Welsh.
1901. 1911. 1901. 1911. 1901. 1911. 1901. 1911.
Total 3 years and upwards 498 537 151 85 348 350 3 28
3 and under 5 }567{ 590 }158{ 130 }272{ 174 }3{ 106
5      "      10 590 97 265 48
10      "      15 570 60 337 33
15      "      25 517 571 104 46 374 360 5 23
25      "      45 487 542 126 62 382 378 5 18
45      "      65 412 457 199 126 387 403 2 14
65 and upwards 355 386 296 224 347 378 2 12