Did you know that if a company were to increase its dividends by 5% per year, it would take 14 years for its payouts to double? A couple of stocks with the most aggressive dividend growth records you can invest in today are UnitedHealth Group (NYSE: UNH) and Broadcom (NASDAQ: AVGO). Health insurance giant UnitedHealth Group may not strike income investors as an ideal dividend stock to buy, as it yields just under 1.4%, which is below the S&P 500's current average yield of 1.7%.