I went up Old Army Pass about ~3-4 weeks ago. From the trail between the lakes it looks impassible as there was (is still?) a chunk of snow towards the crest. However, if you keep going down the trail eventually see where the switchbacks start. If you carefully follow the trail up (it is not obvious in spots) eventually you will get to the snow field. You can veer around it with some bouldering moves.
The trail up Mt Langley is marked with massive cairns. It is easy to follow.
The lakes would be a beautiful place to camp. There were lots of mosquitoes though, so you might want to bring repellent.
