My girls were both about a year old (female pair) when I homed them, my boy was about 4yrs old when I homed him. We do alright, the girls of course are a bit better with me then he is, but a lot of things changed in my life not long after, so he hasn't had quite as much time as the girls with me in addition to not having him as long. The more you invest time wise, the closer your relationship with them will be, but it can take time, more time with some gliders than others.
If you want to message me pics, I'll take a look, but I'm not sure, unless they look really bad, that I can tell you anything.
I do recommend asking if they have been for a vet check up recently.