This is the supporting information for: Girndt et al (Journal of Evolutionary Biology 2019) **Male age and its association with reproductive traits in captive and wild house sparrows** https://onlinelibrary.wiley.com/doi/abs/10.1111/jeb.13542 When using any of the materials, **PLEASE CITE**, together with the original publication: Girndt et al (2019) Supporting information for "**Male age and its association with reproductive traits in captive and wild house sparrows** ". Open Science Framework. OSF. https://doi.org/10.17605/OSF.IO/PKWSR Retrieved: add date & time. All questions related to the content of this project can be directed to : Antje Girndt, a.girndt@gmail.com. **Content**: **Data and Script for Linear mixed models "Sperm length ~ Male age..."** - csv files "**datlinSW_osf**" and "**datlinLU_osf**", contain linear sperm measurements of captive (SW) and wild (LU) house sparrows, all variables are explained in the accompanying script "Linear Age_Analysis_OSF" - R Script "**Linear_Age_Analysis_OSF"**, code for linear mixed models with male age as the main predictor and various sperm length components as response variables **Content**: **Data and Script for Linear mixed models "Cloacal protuberance volume ~ Male age..."** - csv files "**datCP_SW_osf**" and "**datCP_LU_osf**", contain cloacal protuberance measurements of captive (SW) and wild (LU) house sparrows, all variables are explained in the accompanying script "CP_Age_Analysis_OSF" - R Script "**CP_Age_Analysis_OSF**", code for linear mixed models with male age as the main predictor and cloacal protuberance volume as response variable **Content: Data and Script for Generalised linear mixed models "Abnormal sperm ~ Male age..."** - csv files "**databnorm_SW_osf**" and "**databnorm_LU_osf**", contain counts of abnormal sperm of captive (SW) and wild (LU) house sparrows, all variables are explained in the accompanying script "Abnorm_Age_Analysis_OSF" - R Script "**Abnorm_Age_Analysis_OSF**", code for generalised linear mixed models with male age as the main predictor and the proportion of abnormal to normal sperm as response variable **Content: Data for the number of sperm on perivitelline layer** - csv file "datPVLsperm_osf" contains counts of sperm on 41 pervitelline layers of house sparrow sperm plus data on age classes as well as more information on eggs, variables are self-explanatory from column headers - R Script "**PVL_sperm_revised**", R code for t-test and generalised linear mixed model with male age as the main predictor, together with female age, aviary as random effect and the number of sperm at the perivitelline layer of 40 eggs (excluding one outlier) as response variable