Your data is telling you what you need to know about turnover and age.
Jesus M. Gonzalez-Barahona
Jesus M. Gonzalez-Barahona is co-founder of "Bitergia":http://bitergia.com, the software development analytics company specialized in the analysis of free / open source software projects. He also "teaches and researches":http://gsyc.es/~jgb in Universidad Rey Juan Carlos (Spain), in the context of the "GSyC/LibreSoft":http://libresoft.es research group. His interests include the study of communities of software development, with a focus on quantitative and empirical studies. He enjoys taking "photos of the coffee he drinks around the world":http://www.flickr.com/photos/jgbarah/sets/72157633382014597/ .