Gender Medicine in Europe. Females Are Mosaics: X Inactivation and Sex Differences in Disease. The word mosaic is a form of work of art in which pictures are produced joining together minutes pieces of glass, stones and other materials of different colors.
Most GSDs will live to be between 10-13 years of age while 11-12 years is generally considered the average lifespan. A German Shepherd Dog becomes middle-aged between 6 to 7 years of age, and a GSD is generally considered geriatric at around 10. More senior GSD info.
Even though your GSD puppy will reach very close to its adult height by the time it reaches 10-18 months of age, a female German Shepherd will continue to fill out until she is up to 2 years old while it often takes GSD males up to 3 years old to be completely mature.