Congratulations on your beautiful new additions!!
I can take a guess at their mutations, but be aware I may not be completely accurate on them.
Your new girl, I believe she is a sky blue dominant pied greywing. She may be violet too.
Your boy, I think is a light green double factor dominant pied budgie.
The cute chick appears to be a cobalt violet dominant pied spangle budgie.
It's more difficult to give a good estimate on age regarding your oldest budgies because they already have their adult plumages. Looking at the iris rings on the eyes may also be compromised, because it's possible in your girl's case that she has recessive pied genes making her eyes fully black as they seem to be.
The first pic of your boy, I can see the iris on one eye. I'd say both are under 1 year old, I'm sorry I can't be more accurate than that.
The age on the chick sounds about right to me.