Beastie Boys weren’t punk. They were probably the very first band to fuse rock with hip hop.
There’s tons and tons of musicians that didn’t die from disease, drugs or alcohol. We know Bowie died of Cancer, I don’t think Prince’s cause of death was released yet. Alvin Lee of Ten Years After died of complications after stomach surgery. Ronnie James Dio of Black Sabbath, Rainbow and Dio died from stomach cancer. Clive Burr of Iron Maiden died from MS. Stevie Ray Vaughan died in a helicopter crash (this after getting sober) when he was 35.
The “rock star” lifestyle is much too glorified.
They started out as punk. They can be seen punking out in the 1985 movie “Krush Groove.” IIRC they switched to hip hop not long after the movie.
Beastie Boys were originally a punk band... they released an album called Pollywog Stew that was punk and featured a punk version of Egg Raid on Mojo.