( ( ( ( Sarcopenia , ) ( ( ( ( the loss ) ( in ( muscle mass ) ) ) , ) ( related ( to aging ) ) ) ) , ) ( ( starts ( at ( age 25 ) ) ) . ) )
(ROOT (S (NP (NP (NNP Sarcopenia)) (, ,) (NP (NP (DT the) (NN loss)) (PP (IN in) (NP (NN muscle) (NN mass))) (, ,) (VP (VBN related) (PP (TO to) (NP (VBG aging))))) (, ,)) (VP (VBZ starts) (PP (IN at) (NP (NN age) (CD 25)))) (. .)))
Sarcopenia, the loss in muscle mass, related to aging, starts at age 25.
(ROOT (S (NP (NP (NNP Muscle)) (ADJP (RB atrophy) (JJ due) (PP (TO to) (NP (NN age))))) (VP (VBZ is) (VP (VBN called) (NP (NN sarcopenia)))) (. .)))