He was probably about 65 years old when he died.
We have absolutely no idea. He was probably born in about the same time frame as Our Lord and was martyred sometime in the mid to late first century.
Thaddeus William Harris died on January 16, 1856 at the age of 60.
Thaddeus William Harris was born on November 12, 1795 and died on January 16, 1856. Thaddeus William Harris would have been 60 years old at the time of death or 219 years old today.
Saint Bernadette of Lourdes was 35 years old when she died.
saint nicholas of myra was about 73 years old when he died.
Saint Lucy was about 21 years old when she was martyred and became a saint.
Thaddeus Young is 29 years old (birthdate June 21, 1988).
Helena was about 80 years old when she died.
He was 86 years old when he died.
Saint Lucy of Syracuse was about 21 years old when she was killed.
St. Dominic de Guzman was about 51 years old when he died.
The date of Jude's death is not recorded in either scripture nor in tradition. It occurred sometime in the later first century in Persia.The deaths of the apostles are not mentioned in the Bible except for Saint James whose death is mentioned in Acts chapter 12:"Now at that time, Herod the king laid hands on some of those from the Church to harm them. So he executed James the brother of John with a sword."Judas, of course, committed suicide so the above statement refers only to the post-Pentecost apostles when Matthias was chosen to take his place.
Saint Peter died and entered Heaven as a saint when he was about 65 years old.