Black men aged 14-40 are roughly 2.3% of the US population (~8 million of 342 million per Census ACS).
FBI Supplementary Homicide data show Black people as 50-55% of known-race offenders in recent years (nearly all male). The age-crime curve for Black offenders peaks near 19, so the large majority are 14-40. This group thus accounts for an estimated 40-50% of US murders (~5,500-7,000 of the ~14,000 in 2025). Figures reflect known offenders only.