You try and nurture the relationship. This day and age we have to do a little more networking than we used to do. All that does is make sure you befriend the people you are working with on a project so you hopefully carry it over to the next one.
Remember this. Bear Bryant retired at age 69, and he died 28 days after he stopped coaching. If you don't have something, and a purpose in your life, you're gonna die.
It was on the 10th day of May - 1884 - that I confessed to age by mounting spectacles for the first time, and in the same hour I renewed my youth, to outward appearance, by mounting a bicycle for the first time. The spectacles stayed on.