I don't know about any "6 stages" of anything. Usually such models are artificial constructs used by therapists as a guidline for dealing with patients and based on a rather limited cross-section of the population as a whole.
I did find this for you though:
"A particularly conspicuous feature of middle age is that life is restructured in terms of time left to live rather than time since birth. Not only is there a reversal of directionality but an awareness that time is finite".7 Recalling the different meanings a birthday has to a child and to someone in the middle years helps one grasp the idea. The youngster likely greets his birthday as marking his new size, new knowledge, and ever-growing powers and capacities that he expects to exercise in a future that conceived as limitless and open. It is reason to celebrate. For the middle-aged person, the birthday is likely to be a firm reminder of time's passage. It is frequently a time of weighing what has and what has not been achieved -and the future is seen as time remaining. The person may be reminded of his own mortality as a concrete reality rather than as an abstract principle.
This changed time perspective may well foster a 'now or never' attitude. Postponement is easier when the future is extended; when the future is limited, postponenment of goals and wishes merges into relinquishing them. For the middle-aged person, those wishes that had been set aside for such considerations as family, reputation, or career must now be given up or grasped quickly.
I am unpopular with the MLC forum because I tend to relate things back to the latest research and primarily the role that our time perspective profile plays in how we perceive the world around us and interact with others.
I find it particularly interesting how people who have spent much of their lives with a time perspective that is skewed toward "future positive" can suddenly shift to being highly skewed toward a "present hedonic" time perspective. And it can happen at any age, although it is more common around mid-life.
M-47,W-40,No kids D-filed 5/27/2010 Piecing - 10/21/2010 -=Soon to be banned=-