that is slow to those of us in middle age 
(ROOT (S (NP (DT that)) (VP (VBZ is) (ADJP (JJ slow) (PP (IN to) (NP (NP (DT those)) (PP (IN of) (NP (PRP us))) (PP (IN in) (NP (JJ middle) (NN age)))))))))
(ROOT (S (NP (DT )) (VP (VBZ ) (ADJP (JJ ) (PP (IN ) (NP (NP (DT )) (PP (IN ) (NP (PRP ))) (PP (IN ) (NP (JJ ) (NN )))))))))