A middle-aged man is playing a stringed instrument.
The older man plays lead guitar in a band.
Just because the man is playing a stringed instrument does not mean it is a guitar. Even if it is Aguilar, there is no indication that the old man is playing lead guitar, or is even in a band at all.
exists e1 s1 s2 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_instrument(x2) & a_stringed(s2) & Theme(s2,x2) & n_man(x1) & a_middle-aged(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2 x3.(n_man(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1) & in(e1,x3) & n_band(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & a_lead(s2) & Theme(s2,x2))