Is it obligatory for a wife who has been abandoned for many years to observe the waiting period (iddah) after her husband passes away?
                                If her husband passes away, the wife is required to observe the waiting period (Iddah), even if he had abandoned her, because she is his wife and inherits from him, so she must observe the iddah after his death. And Allah Knows Best.
                             
                        
                            
                                
                                Is Zakah (obligatory charity) due on the money saved for marriage?
                                Zakah is due on the money saved for marriage if it reached the Nissab (minimum amount liable for Zakah), and a whole lunar year had lapsed over possessing it.
                             
                        
                            
                                
                                Is it incumbent on the fiancée to obey her fiancé?
                                When the woman settles in her husband`s house, it is incumbent on him to provide for her and it is incumbent on her to obey him. Before that, and if the marriage contract had been concluded, then she is lawfully his wife and thus she should abide by custom in treating him, but if the marriage contract hadn`t been concluded, then she should treat him as a non-Mahram (Marriageable).
                             
                        
                            
                                
                                Is it permissible for a young man to marry a young woman who is only seven months older than him?
                                All perfect praise be to Allah the Lord of the Worlds. May His peace and blessings be upon our Prophet Mohammad and upon all his family and companions.
From an Islamic perspective, it is permissible for a man to marry an older woman. And Allah The Almighty Knows Best..