There's daily self-doubt. But the defining factor is there is nothing else I would rather do and you get more experienced, less vulnerable and become a survivor. Life gets easier. I believe people too easily. I like to trust people and be trusted.
Many older writers feel intimidated by the alleged age barrier in Hollywood.
Rumor on the Web often has it that you must be under 25 in order to be taken seriously as a writer in that community. People who have no life experience have no business writing. Let me put it this way, a serious executive or producer, someone you want to be in business with, will be attracted to the quality of the writing. If they discriminate against you because of age, you probably don't want to be in business with them anyway. Frankly, I am deeply mistrustful of all those entities involved in pitching over the Web.