Took me a while to decipher your awful grammar.
Should you mean "How old would John F Kennedy be if he was alive?"
92 years old, seeing as he was born in '17.
96 yrs
If JFK was still alive now, he would be 95.
John F. Kennedy was 45 in 1962. He was assassinated in 1963, dying at the age of 46. He was the youngest American president elected into office.
34 years old.
"The old American purposes are still wholly relevant" (John F. Kennedy).Meaning still completely relevant- or still completely of importance.
46 years old.
46
John F. Kennedy died on November 22, 1963 (aged 46).
John F. Kennedy was born May 29th, 1917. He ran for president in 1960. He was 43yrs. old.
He was 46 years old.
46
43