Stockholm - Agnetha Faltskog, the blonde singer from the 1970s pop group ABBA, may make a solo comeback at the age of 49, the Swedish daily Aftonbladet said yesterday. The paper quoted a musician friend, Staffan Linde, as saying that Ms Faltskog was considering a return to the studios to make a single which would be the first since her solo album, I stand alone, in 1987.