In adulthood, our lives are more regimented and shaped by our work life, community groups, and often our children’s lives. Unlike young adulthood, our friends are connected to a set of steady, well-defined activities that may go on for many years. The shared experiences with neighbors or perhaps parents on sports fields, at community events, or as colleagues at work make relationships stable and sometimes deep. Stable that is, until those places and activities change.

And when retirement does come, it isn’t just the end of work but the end of years of daily chitchat over cubicle walls, water coolers, or lunchroom tables. We may be banking on spending most of our time with our family, but when our spouse, children, or grandchildren aren’t as available as we expect, we may end up lonely.

Research found that supportive friendships are a stronger predictor of wellbeing than having strong family connections.⁵ As we age, interaction with family is often dictated by obligation, whereas interaction with friends is primarily motivated by pleasure. That’s why it’s essential that we strive to build a network of friends who support us and spend time with us as we age.

Over 2,000 Years Ago, Aristotle Defined Categories of Friends

Even the ancient Greeks recognized the importance of friends. The great philosopher Aristotle categorized our friends into what might be described as the first portfolio approach to friends—utility, fun, and virtuous friends.

Utility friends are the people you see during routine activities, sometimes daily. The people with whom you share a smile, exchange a few good words, or may even have an occasional coffee with. They might be a coworker, the receptionist you say hello to each morning, or a local barista, who already knows your order before you step up to the counter.

Fun friends, as the name might suggest, are those you “just wanna have fun” with, e.g., you’re not looking for advice, consolation, etc. Fun friends are the people that we plan activities together to go out to eat, a hike, or a cruise. In short, they’re often the people that keep you going and doing.

Virtuous friends are our closest friends. They understand where we’ve been and where we are in our lives. They’re the ones who have our permission to nudge us in the right direction or provide support when it’s needed most (e.g., through a medical crisis or the loss of a family member).

While Aristotle named the three types of friends above, there’s another category of friends in our modern lives—developing. They’re acquaintances with whom you think there’s potential for a closer relationship. They’re the endless number of people that we see, cross paths with, and may even share a few words with in-person and online.

Evaluate Your Social Portfolio

Similar to how a well-diversified investment portfolio includes different types of investments, your social portfolio should include different types of friends. Do you think you’re lacking friends in any of the categories? There aren’t hard-and-fast rules about exactly how many friends you should have in each category. It’s good to have at least a few friends in each category.

For anyone thinking their social portfolio needs a boost, there’s good news. There are ways to strengthen it using principles from financial investing: systematic investing, diversification, and monitoring.

• Systematic Investing

  In finance, systematic investing means investing small amounts on a regular basis over a long period of time. Why does it work? Without a consistent habit, investing is an easy thing to procrastinate.

  The same approach can be applied to your social portfolio by investing time in your friendships over time. As we age, especially in retirement, it’s important to invest more time to renew connections with old friends and spend more time meeting new people. Consistency and ritual can help bridge the gap between acquaintances and friends.

• Diversification

  Diversification means including a wide variety of investments within a portfolio. “Don’t put all your eggs in one basket” is sage guidance when it comes to investing. Investing in only one company or fund can be risky if that investment loses value.

  Diversification can apply to your social portfolio too—it’s likely to be stronger if you have a variety of friends. Start by taking an inventory: Can you identify 3-5 friends in each category? If you feel like you’re lacking friends in any of the categories, focus on places and activities where you may have more opportunities to develop friendships.

• Monitoring

  It’s important to review results in your financial portfolio on a regular basis, at least annually. Why? Reviewing gains and losses can help us decide if any portfolio adjustments should be made.

  We should monitor our social portfolio too: Last year, did I gain or lose friends? Did my friendships get stronger or weaker? Am I making enough effort to maintain and make new friends? The answer to these questions can help us determine if our social portfolio needs a little more work or if there are any areas we can tweak.

Remember Three Things About Your Social Portfolio

First, the quality of our friendships is vital to our wellbeing as we age. A strong social portfolio can provide more satisfaction, less isolation, and better health. Second, a social portfolio consists of friends in all four categories: utility, fun, virtuous, and developing. Third, building and maintaining a strong social portfolio requires investing in it using systematic investing, diversification, and monitoring.

To Age Successfully, Don’t Forget to Invest In Your Social Portfolio

What do you think will bring happiness and satisfaction in retirement? Many believe the answer lies in having enough money and time to do the things you want. However, the Harvard Study of Adult Development found otherwise. Their research found that among aging adults surveyed, having healthy relationships was the single most important trait of happiness.⁶ The quality of our friendships is vital to our wellbeing as we age. A strong social portfolio can provide more satisfaction, less isolation, and better health.