It's not for BALPA to make a formal statement per se. They are not qualified in this regard and certainly will not be able to defend their stance on the grounds of ill health. ICAO evidence suggests that the time is now to review the medical demographics in light of recent progress regarding life styles and to take into account SPIFR technology.
60 is the new 50.
IF and I repeat - IF pilots want to fly beyond 60 (commercially) and there is NO evidence to support otherwise - let it be. Australia / Japan / Norway / Germany et al have seen the light and it is only a matter of time before the rest fall into sync.