Stan was right

It takes about 10,759 days for Saturn to complete one revolution around the sun.  That's 28-29 earth years.

The Saturn Return is an astrological phenomenon that occurs at the ages of 27-30, 58-60, and finally from 86-88, coinciding with the time it takes the planet Saturn to make one orbit around the sun. 

It is believed by astrologers that as Saturn "returns" to the degree in which it occupied at the time of birth--approximately every 29.5 years -- a person crosses over a major threshold and into the next stage of life. 

The first Saturn Return is famous because it represents the first test of character and the structures a person has built their lives upon. According to traditions, should these structures be unsound or that a person is living out of touch with his or her true values, the Saturn Return will be a time of upheaval and limitations as Saturn forces him or her to jettison old concepts and worn out patterns of living. It is not uncommon for relationships and jobs to end during this time of life restructuring and reevaluation.

Wikipedia, "Saturn return"

Compare a poet's response:

This spring, you'd swear it actually gets dark earlier. 
At the elegant new restaurants downtown 
your married friends lock glances over the walnut torte: 
it's ten o'clock. They have important jobs 
and go to bed before midnight. Only you 
walking alone up the dazzling avenue 
still feel a girl's excitement, for the thousandth time 
you enter your life as though for the first time, 
as an immigrant enters a huge, mysterious capital: 
Paris, New York. So many wide plazas, so many marble addresses! 
Home, you write feverishly 
in all five notebooks at once, then faint into bed 
dazed with ambition and too many cigarettes. 

Well, what's wrong with that? Nothing, except 
really you don't believe wrinkles mean character 
and know it's an ominous note 
that the Indian skirts flapping on the sidewalk racks 
last summer looked so gay you wanted them all 
but now are marked clearer than price tags: not for you. 
Oh, what were you doing, why weren't you paying attention 
that piercingly blue day, not a cloud in the sky, 
when suddenly "choices" 
ceased to mean "infinite possibilities" 
and became instead "deciding what to do without"? 
No wonder you're happiest now 
riding on trains from one lover to the next. 
In those black, night-mirrored windows 
a wild white face, operatic, still enthralls you: 
a romantic heroine, 
suspended between lives, suspended between destinations.

- Katha Pollit, "On Turning Thirty"