Kemar Roofe also came close to breaking the deadlock when he hit the post following a Craig Braham-Barret cross from the left, before Luke McCormick produced a smart stop to prevent his side from going behind.
After a low-key first half, Byron Harrison gave the Robins the lead early after the restart. The striker cut inside and fired in a shot at goal from the edge of the area, which took a deflection off Trotman and ended up in the back of the net.
Young came close to levelling the contest with his 30-yard swerving effort, but Brown managed to tip the ball onto the post.
Young did get the better of Brown on 84 minutes, however, with his free kick ending up inside the right post to ensure the match finished all square.