Elderly wives (or companions) of puranas:

Though we have many examples of wife being elder than her husband in puranas, like Sita was 6 months elder than Rama, Radha was elder than Krishna and even in the case of Shiva and Shakthi according to Shakthi purana, it was Shakthi who created Shiva, Bramha, Vishnu and proposes them to marry her. But do you know who is known for, the huge difference in age among spouses? 

Its Balaram and revathi, Balaram the elder brother of Krishna,was searching for a suitable partner who met Revathi.

Revati was the only daughter of King Kakudmi (or Raivata), a powerful monarch who rule Kusasthali a prosperous and advanced kingdom under the sea, and who also controlled large tracts of land, including Anarta kingdom. Feeling that no human could prove to be good enough to marry his lovely and talented daughter, King Kakudmi took Revati with him to Brahma-loka (the plane of existence where Lord Brahma, the Creator, resides) to ask Lord Brahma's advice about finding a suitable husband for Revati. When they arrived, Lord Brahma was listening to a musical performance by the Gandharvas, so they waited patiently until the performance was finished. Then, Kakudmi bowed humbly, made his request and presented his shortlist of candidates. Lord Brahma laughed loudly, and explained that time runs differently on different planes of existence in space, and that during the short time they had waited in Brahma-loka to see him, 27 chatur-yugas (a chatur-yuga is a cycle of four yugas, hence 27 catur-yugas total 108 yugas) had passed on. Lord Bramha upon meeting Raivata informs him about Balaram. The Daughter and father then found Balarama and proposed the marriage. Because she was from an earlier yuga, Revati was far taller and larger than her husband-to-be, but Balarama, "beholding the damsel of excessively lofty height", tapped his plough (his characteristic weapon) on her head and she shrunk to the normal height of his. The marriage was then duly celebrated. Revati bore her husband two sons, Nisatha and Ulmuka. Both her sons Nisatha and Ulmuka were killed in the Yadu fratricidal war, after which Balarama also ended his earthly incarnation by meditating on the Coast of Arabic Sea. At his funeral ceremony, Revati ascended onto his funeral pyre and was immolated with him.
It is also said that Mandodari is quite elder than Ravan.                                                    
Even Krishna had a fetish for elderly women (though he was bisexual).                            
The famous apsara or the divine nymph Punjikasthala who later changed her name to anjana was quite elder than kesari the monkey king to whom hanuman was born.   Hidimba devi who fell in love with the pandav kumar Bheem was elder than him.