Bjorn Ulvaeus experienced "love at first sight" when he met Christina Sas but he also had "severe problems" with their age gap romance.
The 79-year-old ABBA star fell for Christina - who is in her 50s - following the collapse of his 41-year marriage to his second wife, music journalist Lena Kallersjo, and the couple married last September - but Bjorn has admitted he was initially very worried about the difference in their ages.
