Yet, there's a notable lack of attention and concern given to the social aspect of retirement, experts said. It's a facet of retirement planning that's almost "hidden in plain sight," said Robert Waldinger, a clinical professor of psychiatry at Harvard Medical School. Money is the "obvious" focus when it comes to retirement planning, Waldinger said. Put another way: "Social connections are really good for us" and "loneliness kills," Waldinger explained in a 2015 TED Talk titled "What makes a good life?" "Some people say, 'It's too late for me'" to make new social connections, Waldinger said.

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