What if your life view changed after 30+

When you grow up day by day, you gradually set up your life view. 

When you are at 20-30 age, the common sense is you should at least have a job, start a family. If you accept this concept, you probably marry a man or woman you met during this period, assuming he/she is ok, maybe not love so much, but overal fit for a marriage. After marriage, you coincidently have a cute baby born. Then you think you have a perfect life as definited.

If you totally follow that life view, would it 100% mean you you can go on with the left life? I mean is it possible you are regret for your decision when you enter next stage 30-40 and became more and more maturer at life view.

You may be more inclined to do sth really interested not just for salary, not to marry a man/woman just fit for marriage, even not to marry sb, or not to have a baby, start a family. You have more confidence and experience which strongly support your inner world to face the society rule.

So what if you do, when your life view changed after 30+, especially already have a family, and cannot bear your spouse any more. But you love your baby, not want he to be involved in single-parent relationship.

That is much controversial, right? So, any good idea to balance this problem?

Expect interesting reply.