How old was Bob Geldof when they organised Live Aid?

Robert Frederick Zenon Geldof is an Irish singer-songwriter, political activist, television producer and entrepreneur. He rose to prominence in the late 1970s as the lead singer of the Irish rock band the Boomtown Rats, who achieved popularity as part of the punk rock movement. The band had UK number one hits with his co-compositions "Rat Trap" and "I Don't Like Mondays". Geldof starred as Pink in Pink Floyd's film Pink Floyd – The Wall (1982).