As it is already said in above answer that marriage between elder bride and younger groom is restricted but for answering the second part of this question that asks for the reference of such marriage, there is a very famous example of marriage between Lord Balarama and Revati is described in Bhagavatam here where Lord Brahma says following words to Kakudmi (Revati's father):

tat putra-pautra-naptṝṇāṁ

 

gotrāṇi ca na śṛṇmahe

 

kālo ’bhiyātas tri-ṇava-

 

catur-yuga-vikalpitaḥ

 

Twenty-seven catur-yugas have already passed. Those upon whom you may have decided are now gone, and so are their sons, grandsons and other descendants. You cannot even hear about their names.

As it is already said in above answer that marriage between elder bride and younger groom is restricted but for answering the second part of this question that asks for the reference of such marriage, there is a very famous example of marriage between Lord Balarama and Revati is described in Bhagavatam here where Lord Brahma says following words to Kakudmi (Revati's father):

tat putra-pautra-naptṝṇāṁ

gotrāṇi ca na śṛṇmahe

kālo ’bhiyātas tri-ṇava-

catur-yuga-vikalpitaḥ

Twenty-seven catur-yugas have already passed. Those upon whom you may have decided are now gone, and so are their sons, grandsons and other descendants. You cannot even hear about their names.

As @Keshav has already said in above answer that marriage between elder bride and younger groom is restricted but for answering the second part of this question that asks for the reference of such marriage, there is a very famous example of marriage between Lord Balarama and Revati is described in Bhagavatam here where Lord Brahma says following words to Kakudmi (Revati's father):

Twenty-seven catur-yugas have already passed.
Those upon whom you may have decided are now gone,
and so are their sons, grandsons and other
descendants. You cannot even hear about their
names.

As it is already said in above answer that marriage between elder bride and younger groom is restricted but for answering the second part of this question that asks for the reference of such marriage, there is a very famous example of marriage between Lord Balarama and Revati is described in Bhagavatam here where Lord Brahma says following words to Kakudmi (Revati's father):

tat putra-pautra-naptṝṇāṁ

gotrāṇi ca na śṛṇmahe

kālo ’bhiyātas tri-ṇava-

catur-yuga-vikalpitaḥ

Twenty-seven catur-yugas have already passed. Those upon whom you may have decided are now gone, and so are their sons, grandsons and other descendants. You cannot even hear about their names.