Differential reproduction is a key driver of evolution that is determined by individual characteristics and mating opportunities, including mate choice. Social interactions between conspecifics are hypothesized to be important in facilitating mate choice and reproductive success but are difficult to measure. Using data from 52 adult barn swallows (Hirundo rustica erythrogaster) whose social interactions were measured via proximity tags, we tested the hypothesis that opposite sex social interactions mediate the relationship between age (a proxy for experience) and condition-dependent plumage traits, and their associations with reproductive success. We found that older female barn swallows have higher fecundity and that older males have higher reproductive success. Darker ventral plumage coloration was not associated with higher reproductive success in either sex, even among experimentally darkened males. We also observed that older birds appear to be less social, as indicated by weaker interaction strength and degree, though these associations only approach statistical significance in males. Finally, despite a robust effect in which older barn swallows have higher reproductive success, we found no evidence of mediation by social interactions. Our results suggest that older, more experienced birds can produce more offspring while being less social.