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Objective: To investigate the prevalence of malaria parasitaemia caused by Plasmodium falciparum between ages and genders among patients in Ibadan city, southwestern Nigeria. Methodology and results: Two hundred (200) patients attending University College Hospital in Ibadan, comprising 95 males and 105 females (ages 0.7-109 years; mean age= 31.2 years) were examined for malaria parasites using 3% Giemsa stained thick and thin films. The study was carried out between March, 2009 and July, 2009, a period characterized by peak rainy season, but no significant seasonal variation was noted. Of the 200 samples examined, 100 were Plasmodium slide-positive indicating an overall prevalence of 50%. The findings show that malaria parasitaemia and intensity are dependent on age and sex, but there was no significant difference in the ages and sex of the patients studied (P> 0.05). Of the 105 samples from females, 58 (55.2%) were positive for malaria parasitaemia while 42 (44.2%) of the samples from 95 males were positive for malaria parasitaemia showing a higher prevalence of malaria parasitaemia in females than their male counterparts. Higher prevalence was noted in age-groups> 46 years, 20/36 (55.6%)] and 16-30years [36/69 (52.1%)]. The age-specific profiles of malaria prevalence in younger infants (< 4 years of age) were much higher (66.7%) than those observed in older children (5-9 years and 10-14 years of age) having 44.4 and 35.7% prevalence rates respectively. It showed that children> 4years were more infected compared to persons> 5 years of age, irrespective of season. Conclusion and application of findings …