Does lying out of forgetfulness, followed by seeking forgiveness, affect the validity of the fast of one who has been accustomed to it since childhood?

He who does not abandon forbidden words and actions, his abstention from food and drink in his fasting has no value. The purpose of this Hadith is to warn against speaking falsehood and acting upon it, and that committing sins diminishes the reward of fasting, and may even nullify it completely. Therefore, a Muslim must strive against his lower self to abandon bad habits, repent, and seek forgiveness.