nostalgic comments from the now middle-aged participants 
(ROOT (NP (NP (JJ nostalgic) (NNS comments)) (PP (IN from) (NP (DT the) (ADJP (RB now) (JJ middle) (HYPH -) (JJ aged)) (NNS participants)))))
(ROOT (NP (NP (JJ ) (NNS )) (PP (IN ) (NP (DT ) (ADJP (RB ) (JJ ) (HYPH ) (JJ )) (NNS )))))