The bestselling personal finance author and the advocacy group for older people warn Americans about the popular retirement accounts. TheStreet Recommended on TheStreet Pro View post: Weekly Roundup: New Highs, Extreme Greed, and Overbought Risk View post: I Traded the Dot-Com Bubble and This AI Frenzy Is Different Most working Americans are aware — and most financial professionals agree — that 401(k) plans and Individual Retirement Accounts (IRAs) are vital retirement savings tools.