The use of expired medication / fillers is inappropriate. It is not usually common to have any problems when the filler was only 3 months expired. I hope
this is helpful.
Congratulations of the weight loss! The best thing to do for somewhat prominent nasolabial folds at yoru age would be some sort of filler material to camouflage the area.
The best fillers for around the lip are usually the HAs or the Hyaluronic acids. This includes restylane, perlane, and juvederm. Radiesse is not usually recommended around the mouth because of the risk of lumps.