The striker scored the only goal of the game to pile the woes on the home side, who went down to their 11th defeat in a row
A second-half goal by Wahyudi Wahid was enough to give the Eagles all three points and propel them out of the bottom two to eighth place.
The Young Lions, who had lost their first 10 games prior to the clash, were the livelier of the two sides in the opening exchanges.
But despite creating some decent chances, Aide Iskandar’s side severely lacked the cutting edge and experience up front to cause any real damage to the Eagles.
Buoyed by their 2-1 win over high-flying Tanjong Pagar United last week, Vedhamuthu Kanan’s side were expected to collect all three points against the Young Lions.
And despite an unimpressive and sluggish first-half, Geylang’s experience proved too much for the Young Lions to handle after the break.
Chances started to flow for the Eagles as the bottom side were obviously struggling for fitness as the game wore on, with players going down with cramps.
Kanan’s side should have been a goal up at the hour mark. The in-form Wahyudi found himself with acres of space in front of goal from a long ball, but he could only blast his shot over the bar.
But the striker more than made up for his horror miss in the 70th minute, ghosting into space and finishing neatly with a diving header after a delicious cross by Yasir Hanapi from the left.
The Eagles nearly found themselves in trouble after what appeared to be a two-footed challenge by Basil Teo in the 84th minute. However, the midfielder was lucky to get away with only a yellow card.
Geylang held on to a narrow but deserved win and moved up three places to eighth. They take on champions Tampines Rovers next Thursday, while the Young Lions face Hougang United next Tuesday.