It may be more common, but I think that if it's stated the first way, it seems less planned and deliberate and it's more likely to rattle the market - or at the

It may be more common, but I think that if it's stated the first way, it seems less planned and deliberate and it's more likely to rattle the market - or at the very least, send the media off looking for nefarious, non-business-related reasons for the retirement. It's almost as bad as suddenly retiring to "spend more time with the family".