Turns out Tom Brady still balling at 40 is NOTHIN' ... that's according to Mark Ingram who says his 39-year-old QB Drew Brees can play for 5 or 6 more years.

Do the math, that's until Brees is 44 ... at least.

We got Ingram at the EA party in Minneapolis and asked him how long he thinks his signal caller can slang the rock ... being that he still looks as sharp as ever.

"At least 5 or 6 more years."