Trump is the exact same age Reagan was when he was first elected, so that isn’t an issue. Rubio has name recognition - no one knows who those guys are you suggested. Rubio will bend whichever way Trump wants him to - he’s a stick-his-finger-in-the-wind-kind of guy. Other than that stupid gang of 8 thing - Rubio is much more likeable than Cruz and conservative on most issues.
Trust me - Trump is in good health and shows no signs of slowing down - Reagan did just fine at the same age.
Trump has also said he wants a VP who is very familiar with the inner workings of DC to help him get his agenda passed.
Agree on Rubio. He’ll fall in line, he’s already saying enforcment only on immigration. He’s a real assett against Hillary. Trump will have to keep an eye on the guy, but he wont stab him in the back like Cruz will.