Background: Coronary heart disease (CHD) is a major health concern and the top cause of death in Bangladesh. Similar to other South Asian nations, Bangladeshis are highly susceptible to CHD, with early onset and severe progression. The exact pathophysiology remains unclear, but genetics, metabolic syndrome, and traditional risk factors are significant contributors. Aim of the study: The aim of the study was to compare the risk factors and coronary heart disease severity in male patients between 25-39 and 40-70 years. Methods: This cross-sectional observational study took place in the Cardiology Department of Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh, spanning from September to December 2013. It involved 166 male CHD patients aged 25-70. Group A comprised 83 patients aged 25-39, while Group B consisted of 83 patients aged 40-70, selected purposively. Results: The mean age of all participants was 43.6±10.6 years. In both groups, most patients had stable angina (Group A: 80%, Group B: 78%). Group A had 70% smokers, 34% with hypertension, and 30% with a family history of IHD, overweight/obesity, and impaired fasting glucose (IFG). In contrast, Group B had 48% hypertensive patients, with 45% smokers, 39% IFG, 31% overweight/obesity, 29% diabetes, and 12% family history of IHD. Vessel involvement was evenly distributed in Group A, while in Group B, 46% had triple vessel involvement. Conclusion: Among coronary heart disease patients aged 25-39 years, the smoking rate is higher, while diabetes prevalence is lower compared to the 40-70 year’s age group. Conversely, in the 40-70-year-old patient group, there is a higher incidence of hypertension, double vessel diseases, and triple vessel diseases compared to the younger group.