[tertius]

If you base your argument on a sub-section of data then you are only trying to support an opinion.

Is 'reaction time' relevant? Is 'cognitive decline' relevant on an individual basis?

What are the other variables that prove relevant to performance you're ignoring? And what is performance?

The reason I ask if this is your opinion or intuition is because of your simplistic argument. It looks like you're trying to defend an opinion. So I ask.