Small called it "dangerous" to refer to stumbling over words on the campaign trail as signs of mental decline.

"I think it's very dangerous to over interpret mental slips, when you see it in an older person, and I think when we do that, it strikes me that it's a form of age discrimination -- what we call ageism," Small said. "We know that there are many factors that affect our mental acuity, people under stress, even giving speeches will increase mental slips of people who are distracted."

What we know about each candidate's health

As the race to the November presidential election goes on, incidences of word slips or fatigue are likely to continue, Small added.

"You're constantly on the road, it's hard to get enough sleep. We know lack of sleep will affect your mental acuity. We know that stress will affect mental acuity. It's difficult to maintain a healthy lifestyle, to exercise regularly," Small said. "There's a lot of adversity on the campaign trail, and that tests a person's emotional stability."

So what do we know about each candidate's health? For now, there is more public information available around their physical than mental health.

Based on the medical records that have been released -- President Trump is on a statin to manage his cholesterol and is considered clinically obese.

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Biden and Trump: Why doctors say attacks on age can be 'dangerous' - STLtoday.com