Not really trying to "spin-doctor," because your concerns are legit. It's not just that he had a cold, after all. He may exercise regularly and be in good shape for an octogenarian, but he's still an octogenarian. Being sick likely means head and chest congestion, exhaustion, and a temperature - and those combined with the kind of speech impediment that gets worse when its sufferer is under stress... Well, it's not a good thing. It results in performances like last night. As he ages, perfect storms of bad luck like that will occur more often, and eventually his age will fully catch up to him.
We need to acknowledge things like that.
At the same time, we need to acknowledge that all in all, he's been a remarkably good president under extremely trying circumstances, and his predecessor - hopefully not his successor - is a felon and a con artist who will open the door for a fascist takeover of this country.
One is too old. The other is a nightmare and the death of this country.