First off, "midlife crisis" is very real. If you don't believe in them feel free to skip this post. I know they're real because I've seen the damage they can do to families. Twice.
I think I've posted about my ex-wife's midlife crisis in a much earlier post, so I'll try to avoid repeating myself. What I'd like to write about here is the overarching reasons for what causes some people to succumb to them.
Society has rules and guidelines. They may not be written down or carved into marble to be displayed. But we all know the rules. Some of these rules set expectations for the roles spouses and parents play in a marriage and raising children. Society tends to punish those who do not conform to these rules, and commend (to some degree) those who do.
Now imagine you're 20 years old. You've met someone you really like and fallen in love. They're compatible and for one reason the two of you discuss the subject of marriage; either casually or through a formal proposal. The two of you agree, you're engaged, and later on you get married! As time goes on you and your spouse discuss the subject of children, either before or after a pregnancy. The two of you agree to move forward and the two of you have a baby! You're now a spouse and a parent! Congratulations!
Time goes on. You turn 30. Your spouse is familiar. Your children call you mama or papa. You perform the role and and do your best to be a good spouse and a good parent.
Time goes on. You turn 40. Your spouse's bad habits annoy you. Your children rely on you for everything. You continue to perform your role as best as you can. But resentment is starting to grow.
SOMETHING BREAKS INSIDE YOU
You can't take it any longer! You've been a spouse and a parent for nearly 20 years! You've sacrificed 20 years of your life that you will never get back. You have lost that time, those decades, forever. You performed the roles: spouse, parent...and along the way you buried your real self. You expect to be rewarded, to be thanked, for this sacrifice; for performing this role for 20 years! But instead you get nothing.
You're never called your name. You're called Darling, Honey, mama, papa. Your ears never hear your own name.
You are seething with resentment. They have stolen 20 years of your life! In return you have not been rewarded or thanked, if anything the expectations continue. You feel your identity has been buried so deep you need a shovel to excavate it.
You leave your family. Fuck them. You leave your spouse. Fuck them. You leave your kids. Fuck them. All a bunch of ungrateful bastards that have done nothing but stolen time from you. They've even stolen your identity from you! But enough is enough. You take your identity back. You are no longer the spouse. You are no longer the parent. From now you will be called by your first name!
All this lost time! You have to make up for all this lost time! Okay, you got married when you were 20 years old... What did you miss out on at 20 years old that you should have experienced. PARTYING! You deserve to have fun! Take drugs! Have sex! Lots of drugs! Lots of sex! Party, party, party! You have 20 years of partying to make up for losing!
From the outside, people see a pathetic 40 year old acting like they're 21. They've shirked their responsibilities. They are driven solely by hedonistic selfishness.
Inside...that 40 year old...thinks they're 21--the 21 year old they should have chosen to be.
At it's core, the person succumbing to a midlife crisis feels they've been cheated out of decades of their life. Once they're at that point, long-term thinking goes out the window, as does consideration for others. They are now 100% focused on themselves and their pleasure, because they feel they've been focused on others for the past 20 years, and that their own pleasure had been ignored during that time.
One important note I need to add, is that this is the perception of the person in a midlife crisis. They could very well have had a dutiful spouse, a fulfilling sex life, and grateful children. But it is not enough to quiet the voice in their head.