dwts

When Season 21 of Dancing With the Stars premieres tonight, it will feature three celebrity contestants 60 or older. It’s another smart casting call by ABC execs, who are well aware that last year’s median age for DWTS viewers was 61.6.

This year's May sweeps end Wednesday night - and the schedule over these final four days is a veritable dessert cart of TV goodness. Tomorrow night (5/20), there's the delectable "Mel Brooks: Make a Noise"  offered by PBS's American Masters. Also tomorrow night: the final performance show of this…