Retiring by age 40 can be possible, but it requires careful financial planning and very aggressive saving. 1. Get rid of debt and reach your savings maximums · 2. Save independently with IRAs · 3. Maintain the right investment mix and reduce risk · 4. Emergency fund. Big expenses pop up without notice, as does losing a job. · A debt-free plan · Save for retirement at 40 · Investing in your 40s outside of non-.