A man in a button up shirt is playing the xylophone.
A young man is performing an instrument.
A man is playing an instrument does not infer how young or old he is.
exists e1 x1 x2 x3 x4.(n_xylophone(x4) & Theme(e1,x4) & Actor(e1,x1) & v_play(e1) & up(x1,x3) & n_shirt(x3) & in(x1,x2) & n_button(x2) & n_man(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_instrument(x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))