There are six male Tory MPs who fit the parameters described, i.e. they
became members of Parliament in 2001 and are between the ages of 50 and 59.
Boris Johnson
Jonathan Djangoly
Bill Wiggin
Mark Francois
Andrew Rosindell
Richard Bacon
One of those is trending on Twitter, and it isn't in fact Andrew Rosindell. I bet five of them are seriously pissed off (or maybe four, Johnson must know that no-one will seriously believe that it was him, not least because the sudden absence of the PM from Parliament would be a bit bloody obvious).