How do helpers slow senescence in a Tibetan cooperatively breeding bird?

Abstract Sociality is known to be capable of slowing individual senescence, but it unclear whether the effect differs for reproduction versus survival in a sex‐specific manner. Here we predict that social benefits are directed toward (1) somatic maintenance harsh environments where high prospects adults over young intensify trade‐off between current and future reproduction, (2) females invest more have greater marginal if their improved by reducing cost reproduction. These two predictions tested with cooperatively breeding Tibetan ground tits ( Pseudopodoces humilis ). Across lifetime, both mothers fathers helpers did not differ brood size at fledging from counterparts without helpers. The presence reduced senescence parents, benefited than receiving help. Consequently, inherent sex difference life span along lifetime reproductive success, as expressed breeders never‐receiving help, became no longer obvious. model modulation should facilitate persistence cooperative challenging environments.