Take these people who have all signed off as a cross-section of society and forget they are celebrities and you get three distinct "camps"
1. Those who were older than the average life expectancy - ie Ronnie Corbett, Harper Lee, the bloke who wrote Watership Down, Leonard Cohen, Nancy Reagan, Muhammad Ali, George Martin, Liz Smith, Jimmy Young - nothing unusual there. Then those getting close - ie Terry Wogan.
2. The younger ones (Prince, George Michael, Pete Burns, Carrie Fisher even) - who abused their bodies with substances, sex and booze and led wild lifestyles - going to take its toll in the same way as the characters you see on Jeremy Kyle or drunk on the streets.
3. Those who died before their time - Victoria Wood, Alan Rickman, David Bowie - yes, your 60s is too young to go - well, this happens. People get cancer and other illnesses in their 40s, 50s and 60s and some die of it - nothing unusual here either. Though it's sad.
It's not spooky - it's easily explainable.