The period in your life occuring between 20 and 30 years of age, when you realize that a quarter of your life is over and :
a) You've done nothing constructive with it
- AND -
b) You've set yourself up for another quarter just like it.
You may be experiencing a quarter life crisis if :
a) You ever ask yourself what the h*** you are doing with your life
b) You regret half of the last 10 years
c) You consider changing jobs/homes/partners/all of the above to somehow improve your life
d) You feel lost and confused 23.5 hours out of a 24 hour day
e) You wonder how you will ever find job security/afford a house at today's prices/find a partner if you're working all the time/get out of your parents' house if your debt is costing you every dime you make/afford rent while it keeps going up/find a job that pays the bills/pay off your debt/all of the above. Usually all of the above.
Often confused by kids with adolesence, puberty, or hormonal problems. Feeling "misunderstood" and dressing all in black is not a quarter life crisis - it is being a teenager.
Basically, you wake up one morning and think to yourself, "Man - I'm totally screwed." You then proceed to consolidate your debt, look for a better job, and spend more time sleeping - because when you're asleep, you don't have to worry about how screwed you are.
"Man, I've wasted the last 20 years. At least I'm not alone - everyone has a quarter life crisis."