Old make up is a no no, it can cause an infection and you can end up with blepharitis which is really horrible, especially if you have it bad, life long condition which makes your upper eye lids swell and makes you look older than what you are. The doctors can throw long term Antibiotics at blepharitis if they think it is caused by an infection to try and get the condition under control, if you get it bad, you will wish you never used old make up.