We do not really know when the contemporaries of Jesus and of St Paul were born or died.
The Gospel According to St Matthew was actually written by an anonymous author and was not attributed to Matthew until several decades after the Gospel was written. So, the fact that Matthew's Gospel appears to have been written around the year 80, does not give us any useful information about the lifespan of the real St Matthew, except perhaps that he may well have lived most of his life in the first century AD.
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