The AARP poll was conducted by landline, cell phone and text-to-web by a bipartisan team from Sept. 17 to Sept. 24.
Harris' weakest point is with senior citizens, AARP's response data shows.
Seniors aged 65 years and older broke for Trump by seven points, according to the data.
It is a major shift after Trump was trailing previous Democratic candidate President Biden by one point before he dropped out and Harris became the party's nominee.
The AARP survey found that 50% of likely voters approve of Trump's performance as president from 2016 to 2020. About 49% disapprove of his job performance in the Oval Office.
Approximately 45% approve of Harris' performance as vice president, while 52% disapprove.
The AARP survey spoke with 1,398 likely voters in Pennsylvania and has an overall margin of error of four percentage points.
An over-sample of 470 likely voters within the state who are 50 years old and up was included in the data with a margin of error of three and half percentage points.