How should my older boys be acting?

[Argent]

I have my three new bubs in the bottom section of my three-tier cage. It's definately plenty of room for them for now while they settle in, but how should my older two be acting? The fuzzlets don't really have a very strong odor but I'm sure rats can detect far more than I can. My big boys just seem a bit sleepy,which they tend to do since my room's pretty warm and i've been watching babies pinging about for a while XD
I guess I'm a little concerned there may be something I'm missing, or are they really not bothered about the babies or not noticed them?
Neither are poofed up or acting dominant at all lol, just lazy and sleepy...

 

[ryelle]

How old are they?

 

[Argent]

Roughly 6-7 months, not that old really (according to the guy that brought them into P@H)