A good way to supplement your Social Security checks is to save for retirement consistently. If you're in your 20s or 30s, you may not have the largest 401(k) balance right now. Recent data from Fidelity shows that the typical 401(k) balance among Americans 70 and older actually isn't all that large. What the average 401(k) balance for Americans 70+ looks likeAs of June 2026, the average 401(k) balance for savers 70 and older was $264,500, says Fidelity. Even when Social Security is added in, it's not a ton of spending power.