from a shopper ...
"seniors twin birthday cards.  My two aunts are in their 80's and are sharing a birthday in August.  I would really have liked to have bought them twin birthday cards, but ones more appropriate for ladies in their 80's than youngsters.  Maybe you could consider adding some to your collection in the next few years."
 
So shopper was looking for older (80s) age specific birthday for twins card designs and general birthday for twins cards with more mature designs.  These new cards should NOT be Aunt specific.
 
These cards would be found here accordingly:
Birthday >> For Twins >> Age Specific  
or
Birthday >> For Twins >> General  
 
Do NOT mark these cards for FastTrack.