Victor Emmanuel was born on Nov. 11, 1869, in Naples. After his father, Umberto I, was assassinated in 1900, Victor Emmanuel succeeded to the throne.
Victor Emmanuel was in his thirties when his father was killed.
Based on the dates of his birth and the assassination, he would have been in his thirties. The statement is correct. 
( z1 person :name ( z2 name :op "Victor" :op "Emmanuel" ) :age ( z3 between :op ( z4 temporal-quantity :quant 30 :unit ( z5 year ) ) :op ( z6 temporal-quantity :quant 30 :unit ( z7 year ) ) ) :time-of ( z8 kill :ARG1 ( z9 person :ARG0-of ( z10 have-rel-role :ARG1 z1 :ARG2 ( z11 father ) ) ) ) )