Big Sister matches girls between the ages of 7 and 15 in one-to-one relationships with caring women mentors. In our largest, signature program, Community-Based Mentoring, girls can remain Little Sisters until the age of 20, at which time they are then old enough to become Big Sisters. While our Little Sisters come from a wide range of ethnic, socio-economic, and family backgrounds, our typical Little Sister is 12 years old; living with a single mother in Dorchester or Roxbury; and is Black or Hispanic. Below is a further breakdown of these demographics. In 2012, we served more than 2,600 girls in all of our mentoring programs. | Little Sisters by Age | | 7 - 10 | 31% | | 11 - 13 | 40% | | 14 + | 29% |
| | Little Sisters by Ethnicity | | African American/Black | 35% | | Hispanic | 30% | | Caucasian | 13% | | Multi-racial | 10% | | Asian | 6% | | Other | 6% |
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| Little Sisters by Region | | Boston | 71% | | West Suburbs/Cambridge | 12% | | North Shore | 10% | | South Shore | 6% | | Other Service Area | 1% |
| | Little Sisters by Living Situation | | One Parent (Female) | 44% | | Two Parents | 29% | | Other Guardian | 17% | | Grandparents | 4% | | One Parent (Male) | 3% | | Other Relative | 2% | | Foster Home | 2% |
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| Little Sisters by Boston Neighborhood (71%) | | Roxbury | 23% | | Dorchester | 23% | | South End | 10% | | Mattapan | 7% | | East Boston | 5% | | Brighton | 4% | | Hyde Park | 4% | | Jamaica Plain | 4% | | Roslindale | 4% | | South Boston | 3% | | Fenway | 3% | | Charlestown | 3% | | Allston | 2% | Chinatown | 1% | | Back Bay | 1% | | West Roxbury | 1% | | North End | <1% | | Beacon Hill | <1% |
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