How old is 7:AMP? This image appears in the gallery:8 facts you need to know about rapper 7:AMP, Billie Eilish's ex-boyfriend 4. How old is 7:AMP? 7:AMP is 24-years-old. (Picture: Instagram) 7 images See the full gallery: 8 facts you need to know about rapper 7:AMP, Billie Eilish's ex-boyfriend