Diets for men in their prime
( Diets ( for ( men ( in ( their prime ) ) ) ) )
(ROOT (NP (NP (NNS Diets)) (PP (IN for) (NP (NP (NNS men)) (PP (IN in) (NP (PRP$ their) (JJ prime)))))))
Healthy eating choices for optimally aged men. 
( ( ( Healthy ( eating choices ) ) ( for ( ( optimally aged ) men ) ) ) . )
(ROOT (NP (NP (JJ Healthy) (JJ eating) (NNS choices)) (PP (IN for) (NP (ADJP (RB optimally) (VBN aged)) (NNS men))) (. .)))