How old was Blondie when she first started singing?

Blondie, the iconic band fronted by Debbie Harry, formed in 1974. Debbie Harry was born on July 1, 1945, which means she was around 29 years old when she began her music career with the band. However, she had been performing in various bands since the late 1960s, giving her a musical background before Blondie's formation.