Life without 愛 is meaningless. 愛 was born even before mankind was born and it still exists in all kinds of organism, including humans. Though 愛 is expressed in various forms and between different relationships, eternal 愛 is accomplished between a man and a woman. 愛 is one trait that never diminishes as long as あなた give it to others and keeps on growing.
There are immortal stories on 恋愛中 and immortal 名言・格言 on love. Even in the stories that ended in tragedy, 愛 has never failed but only the 恋愛中 have. They stand evergreen and are suitable for all ages of time, whatever is the advancement in technology and science. They are suitable.