Agreed.
57 is the maximum age for an ideal, first-term candidate. 57 gives two four-year terms, while remaining under the retirement age. Colbert will reach retirement age in his first term.
Colbert isn't an ideal candidate, but he's not a bad one. He's electable, as is Jon Stewart.
Biden was able to run on a "lesser evil" platform. He won because he wasn't Trump. Hillary or Harris could have won in 2020.