Biden was born in 1942 and Trump was born in 1946.
There is a 4 year difference in their age. Trump has
an overweight problem and yet he seems to have the
energy to be an active campaigner. Biden does not
seem to have the mental alertness needed to be
active campaigner.
Bottom Line: Both of these men are too old to be
President in 2020. Biden would be 78 yrs. old
and Trump would be 74 yrs old.
I would debate his ability to be an "active campaigner", but it's amazing how he gets a pass for all of his obvious signs of dementia.