While many retirement portfolios took a sharp nosedive at the start of the pandemic, times have changed. Retirement accounts are now back to pre-pandemic highs and the number of 401(k) millionaires hit an all-time record in the first quarter of 2021. But even if you've struck it rich with your investment portfolio today, there may be a new reason to worry. How much will that six figure 401(k) really be worth after inflation has eaten away at your portfolio?