Retiring at 62 with $400,000 and monthly expenses of $3,500 is possible, but there are some important considerations. If you start Social Security at 62, your benefits will be reduced compared to waiting until full retirement age, which could impact your long-term financial situation. You might want to use tools like the 4% rule to estimate safe withdrawal rates from your 401k, though remember this is a guideline, not a guarantee. Also, consider potential medical costs as you age and factor in inflation. Working a few more years could enhance your savings and delay Social Security for larger benefits. Consulting with a financial advisor could provide a tailored plan for your specific situation.