Muhammad married Sawda in Ramadan in the tenth year after his prophethood (i.e., in April–May 620), a few months after the death of Khadija. According to Ibn Sa’d Sawda died in the year 54 after Hijra, If she lived to become an octogenarian she must have married Muhammad at the age of 27. If she reached the age of 90 then she could not have been older than 37 when she married the prophet who was 50 years old at that time. However there are sources that put her death in the year 644.