"Robert Smith's depression prior to the recording of Disintegration gave way to the realization on his 29th birthday that he would turn 30 in one year. This was frightening to him, as he felt all the masterpieces in rock and roll had been completed well before the band members reached such an age."
Robert Smith was born in April 1959, finished recording Disintegration before he turned 30, and next produced Wish, which kind of proved his point.
Here are four more songwriters of the 80s, and what they produced either side of their 30th birthdays:
Steve Harris – Mar '56 – Powerslave – Somewhere In Time
Andrew Eldritch – May '59 – Floodland – Vision Thing
Dave Mustaine – Sep '61– Rust in Peace – Countdown To Extinction
James Hetfield – Aug '63 – The Black Album – Load
I had the idea of looking up every songwriter I could think of but seem to have run out of energy.
Plenty of songwriters seem to fall off their creative plateau well before 30 - Black Francis, Paul McCartney, erm Simon Le Bon. You get the gist.