I wonder whether they are confusing the idea of having had a job, family, extra curricular activities; these tasks; a full to-do-list with the fact that these tasks are no longer there. Is it possible that we are defining ourselves by being involved, being creative, being productive? Is that how we determine our purpose?
Those with a more spiritual perspective would argue that our purpose is determined by our creator who bestows certain gifts on each of us. Our purpose then is to use these gifts to improve the human condition.
Which ever you believe, or, some combination of the above, if you don't take action you'll never know. Each of us is responsible to keep ourselves going, being involved, active and productive. Using our gifts and skills to make this world, or at least your little corner of the world, the best place it can be.
Do you have (a) purpose?