President Biden’s age and health and former President Trump’s legal woes are serious issues of concern for voters, according to a new poll ahead of a potential November rematch between the two. The latest NBC News poll found 76 percent of voters had major or moderate concerns when asked whether Biden, 81, has “the necessary mental and physical health to be president for a second term.” Another 13 percent said they had minor concerns, while 11 percent said they had no real concerns on the issue.