Microfinance programmes are increasingly used to support youth entrepreneurship in Nairobi, Kenya, aiming to enhance business growth and market access. A comprehensive literature review method was employed, synthesizing existing studies and reports on microfinance impacts in Kenya's youth entrepreneurship sector. The analysis reveals that microfinance provided significant support for skill enhancement (average increase of 20% in entrepreneurial skills), which correlated with improved market access (85% of participants reported enhanced visibility) and positive business growth metrics (mean annual revenue growth of 15%). Microfinance programmes have a substantial role in supporting youth entrepreneurship, particularly through skill development that leads to better market engagement and financial performance. Further research should explore the long-term effects of microfinance on sustainable business growth among young entrepreneurs. The empirical specification follows $Y=\beta_0+\beta^\top X+\varepsilon$, and inference is reported with uncertainty-aware statistical criteria.