Half an hour before kick-off, Ben met Sir Alex and was presented with a signed Manchester United shirt.
Inspired by United winger Marcus Rashford, the 10-year-old began his ‘Miles for Meals’ walk from Inver Park, home of Larne Football Club, on 3 March and concluded his challenge on Sir Matt Busby Way at 14:30 GMT on Saturday.
Ben’s aim was to walk 50 miles to raise money to provide 50,000 meals for kids through food-poverty charity Fareshare.
Incredibly, he has exceeded this target and is aiming for more.
Jane Gregg, daughter of Northern Ireland legend Harry Gregg, who played for Manchester United from 1957 to 1966, accompanied Ben on the final leg of his walk.