As people age their dominant facial expression may start forming permanent creases on their face, and that may give you a slight hint of their actual character. Same applies to posture.
Basically, things that don’t matter: Looks, clothes, etc. They may give you some hints about person’s habits, but not character.
Things that do matter and might give you some hints: Body language, facial expression, creases and permanent wrinkles. You need to look past makeup for that.
And even in that case the person may be faking it.
For example, could an innocent-looking women be a liar to her dates for money and profits?