Yes, their physiques suck, compared with what they used to be.
HOWEVER...
For the fans there... and for you personally... this might be the last time EVER seeing this. Personally, I'd MUCH rather see Jordan vs. Magic in a game of 1-on-1, TODAY, even if they were both old and slow... MUCH rather than see John Wall vs Chris Paul in a game of 1-on-1. Sure, the new NBA guys are faster and better... but we're talking Magic Johnson and Jordan, dude. Two of the greatest ever. This posedown is a decade of mano-y-mano... I'd rather see this, than see two no-name current pros who look better.