3 Retirement Rules Everyone Should Follow

About one in four 65-year-olds in America today will live past 90, and one in 10 will live until at least 95. Life expectancy has increased dramatically, going up an average of two months annually from 1960 to 2015 in the U.S. So, the great news is, odds are you'll enjoy a long retirement.

The bad news: You're going to have to fund that retirement with far less help than past generations had. Just 33% of private sector workers have a pension today, and tomorrow's seniors are facing Social Security benefit cuts thanks to projected shortfalls in the Social Security trust fund starting in 2034.

Since funding your retirement may fall largely on your shoulders, there are some rules to follow to ensure you'll have the money you need for your golden years.

Binder with retirement savings plan next to coffee and calculator
Binder with retirement savings plan next to coffee and calculator

Image source: Getty Images.

1. Save early and aggressively for retirement

Conventional wisdom says saving 10% of your income will give you enough money for retirement. Conventional wisdom is probably wrong.

This table -- which shows how much you'd end up with by saving 10% of an average $51,000 salary -- reveals the problem.

If you don't invest early, saving 10% won't give you enough. The $372,840 nest egg you'd amass if you started saving at 40 -- assuming everything goes right and returns are higher than most experts project -- would give you less than $15,000 in annual income during retirement. That's just not enough for most seniors, especially when factoring in inflation..

Age You Begin Investing

5% Return

6% Return

7% Return

8% Return

20

$814,470.00

$1,080,000

$1,460,000

$1,970,000

30

$460,633

$568,317

$705,008

$878,815

40

$243,408

$279,809

$322,570

$372,840

50

$110,050

$118,707

$128,158

$138,475

60

$28,180

$28,748

$29,328

$29,919

Author calculations.

Unless you've started early and you get lucky with returns, saving 10% simply isn't enough. Instead, aim to save at least 15% of your income for retirement. And remember, no matter how old you are when you start investing, saving more pays off. Adding just $1,000 to your 401(k) per year starting at age 30 could net you an additional $123,337 by age 67, assuming a 7% rate of return -- and it would only cost around $38.40 per paycheck if you're paid biweekly.

To find extra cash for investing, look to cut unnecessary spending. Eating more meals at home, making a meal plan to avoid throwing out leftovers, cutting out fees and subscriptions you no longer need, and cutting cable are all simple changes.

While making a budget to overhaul spending is helpful, the simplest approach is to set up automatic withdrawals to fund retirement and live on what's left of your paycheck after contributions are deducted.