Is It Smart to Buy Stocks Nearly 4 Years Into a Bull Market? History Offers a Clear Answer.

The S&P 500 bull market, now 47 months old, is still below the historical average of 5.6 years and has delivered 129% returns versus the average 167%, suggesting potential for another 16.5% upside. Market strength is broadening beyond megacap AI stocks, with 57% of S&P 500 constituents outperforming the index this year—the highest level in a decade—indicating a healthier, more sustainable bull market.