Depends on which side of 43 you are looking from.
Que tiene 43 años ('that you are/he/she is 43 years old')Tengo cuarenta y tres an~os ('I am forty three years old')
John F. Kennedy was born May 29th, 1917. He ran for president in 1960. He was 43yrs. old.
43 years old
43 years old
43 years old
You are 43 years old.
56 years old
43 years old
43 years old
43 years old
He was 43 years old.
He was 43 years old.