Totally ridiculous.

The disappointment of watching two very-much-former greats making a shitshow of a match will dwarf any nostalgia that would sell the tickets in the first place.

I'm sure they are in great shape for 50 year olds, but that doesn't mean much when you are comparing to peak condition 20-35 year olds.

Speed, power, sight, reflexes... it all declines as we get older.