Showed up many of Kennedy's age (7)
I believe the answer is:
camelot
'kennedy's age' is the definition.
I can't judge whether this defines the answer.
'showed up many' is the wordplay.
'showed up' becomes 'came' (to show up is to come or attend).
'many' becomes 'lot' (a lot of something).
'came'+'lot'='CAMELOT'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for camelot that I've seen before include "King Arthur's court - or JFK's" , "romantic place" , "Legendary court" , "royal court" , "King Arthur's town" .)