about the need to stay in touch with your own skin , at 18 or 80 
(ROOT (PP (IN about) (NP (DT the) (NN need) (S (VP (TO to) (VP (VB stay) (PP (IN in) (NP (NP (NN touch)) (PP (IN with) (NP (PRP$ your) (JJ own) (NN skin))))) (, ,) (PP (IN at) (NP (CD 18) (CC or) (CD 80)))))))))
(ROOT (PP (IN ) (NP (DT ) (NN ) (S (VP (TO ) (VP (VB ) (PP (IN ) (NP (NP (NN )) (PP (IN ) (NP (PRP$ ) (JJ ) (NN ))))) (, ) (PP (IN ) (NP (CD ) (CC ) (CD )))))))))