A study on bone microstructure determined that ''Fasolasuchus'' had a relatively fast growth rate, similar to most othersother "rauisuchians", with the exception of ''[[Prestosuchus]]''. The same study also determined that the specimen was somatically and skeletally mature, but it wasn't possible to determine sexual maturity: this may be due to taphonomic causes, however the bone cortex was mostly preserved and didn't show the changes in bone matrix or in vascularization that would be expected if the specimen was sexually mature. Alternatively, ''Fasolasuchus'' attained sexual maturity contemporaneously to or slightly later than somatic and skeletal maturity (although this growth pattern is today only found in birds, not crocodilians), or there were differences in the timing of maturity of different bones in the same individual, as reported in the [[tuatara]] and in some dinosaurs.<ref>{{Cite journal |last=Ponce |first=Denis A. |last2=Scheyer |first2=Torsten M. |last3=Cerda |first3=Ignacio A. |last4=Desojo |first4=Julia B. |date=2023-07-31 |title=Palaeobiological inferences of “rauisuchians” Fasolasuchus tenax (Los Colorados Fm., Argentina) and Prestosuchus chiniquensis (Santa Maria Super sequence, Brazil) from the Middle–Upper Triassic of South America based on microstructural analyses |url=https://onlinelibrary.wiley.com/doi/10.1111/joa.13937 |journal=Journal of Anatomy |language=en |doi=10.1111/joa.13937 |issn=0021-8782}}</ref>
