Women live longer than men and need to invest more, according to David Bach, author of Smart Women Finish Rich and founder of AE Wealth Management.

"You've got to be upping your 401(k) plan, saving all the way through your career," Bach said in an interview with TheStreet during Women's History Month. "Often women are a little bit too conservative on the way they invest in their portfolios."

Bach said married women outlive their husband by an average of seven years. 

For more from AlphaRising and Women's History Month in March, check out these stories:

5 Things to Know About Wall Street's Fearless Girl

International Women's Day: Meet Ayah Bdeir and Watch Her Take on Legos

Wall Street Women In History: Meet the First Female Stockbroker (Video)

Women's History Month Podcast: Show Up, Stand Up, Speak Up

Women's History Month: Meet the Women Who Paved Wall Street for the Rest of Us