Anonlinearage-dependentpopulationmodel,whichallowsforconsiderationoftheeffectsofcrowdingandresourcelimitation,ispresented.Thebasicpropertiesofsolution,suchasexistence,positivity,uniqueness,andultimatebehavior,arediscussed.Also,theconditionofstabilityandcontroll-abilityofthenonlinearpopulationsystemisobtained.