The age of rockers when they wrote their classics - 23-ish

A thought-provoking article in Loudwire about the age rock musicians were at when they wrote their classic albums/songs. All Black Sabbath members were at the age of 20/21 when they wrote their debut, Kurt Cobain was 23 in 1990 when he wrote Nirvana's 'Smells Like Teen Spirit', as old as equally left-handed Jimi Hendrix was when he wrote 'Are You Experienced'. Metallica were 21, 22, and 23 when they wrote their masterpiece 'Master of Puppets', while Silverchair members, at the time of their multiplatinum debut 'Frogstomp', were just children - 14 years old!