Is it permissible for a young man to marry a woman three years his senior and divorced, despite his parents' disapproval?

You are permitted to marry this man without his family's consent, and this does not affect the validity of the marriage. However, the man is advised to try and convince his family, seeking the help of wise individuals for this purpose. If they do not agree, then you both should consider the potential harms resulting from marriage without their permission, consult with trustworthy and knowledgeable people, and seek guidance from Allah (istikharah).