As these figures show, there is a considerable portion of the prostitutes who are minors, but they do not tell us of the number of adults who embraced the profession while they were yet under age. As to this point, Dr. Bonhoeffer gives the following, showing the age at which the prostitutes whom he examined began the practice of their profession:[97]
Breslau.
| 16 years old or under | 30 |  | 54% |
| Between 17 and 18 years | 44 | ||
| Between,, 19 and,, 20 years,, | 28 | ||
| Between,, 21 and,, 50 years,, | 88 | 46% | |
| 190 | 100% |
Parent-Duchatelet gives the following table:[98]
Paris.
| Age at the Time of Registration. | Number. | Percentage. | |
| 10 | 2 | 50.4 | |
| 11 | 3 | ||
| 12 | 3 | ||
| 13 | 6 | ||
| 14 | 20 | ||
| 15 | 51 | ||
| 16 | 111 | ||
| 17 | 149 | ||
| 18 | 279 | ||
| 19 | 322 | ||
| 20 | 389 | ||
| 21 | 303 | ||
| Over 21 years | 1,610 | 49.6 | |
| 3,248 | 100.0 | ||
[[328]]
Dr. Fiaux gives the following figures:[99]
Russia.
| Age at the Time of Registration. | Percentage. | ||
| 11 or younger | 1.2 | 80.5 | |
| 13 to 15 | 9.0 | ||
| 15 to,, 16 | 12.9 | ||
| 16 to,, 18 | 30.8 | ||
| 18 to,, 21 | 26.6 | ||
| 21 and over | 19.5 | 19.5 | |
| 100.0 | 100.0 | ||