Although under the cosh for long spells Stevie Campbell's very young side dug out a goalless draw at Balgownie Playing Fields on Saturday morning.
The tone was set in the first minute when Conor Grant pulled off a great save to prevent the Dons from taking an early lead.
However, having survived a torrid opening 20 minutes, the young Tangerines would have forged in front had David Brophy directed his header on target.
Though having to defend desperately at times, United survived unscathed through to the interval.
Indeed, had Kieran Colgan made contact with a Ryan Dow cross just before the break, they would have actually gone in ahead.
The same story unfolded in the second half as Aberdeen continued to dominate.
But dogged defending kept them at bay, with United even creating the better of the chances.
If only for their sheer resolution at the back, the Tannadice teenagers deserved to head back south with a point.
Dundee United: Grant, Irvine, Reoch, Lee, Shaw, Brophy (Murray 70), Stokes, Allan (L Swanson 85), Colgan (Scott 60), K Smith, Dow. Subs not used: Hindley, Leitch, Nelson.