Mickelson is about to retire. in preparation, he has begun to take up golf as a way to fill some of the time he would normally have been at work. mickelson's response best fits with the theory concerning successful aging.

The answer is Activity theory.

Activity theory proposes that for a successful ageing process to occur, older adults should stay active and maintain their social interactions. So, Mickelson's response to his retirement fits well with this theory because he still found an activity to fill the time he was previously using for work.

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