Things like wearing contacts and dying the hair are an attempt to conceal genetics

[Mister Obvious]

. . . these people are likely victims of abuse (or otherwise traumatized, specific types of trauma can cause this) . . .

Usually abused as children or very young people (sometimes even in young adulthood though usually it happens well before that).

They could be traumatized from something existential, like the loss of a loved one which then makes them bitter toward life itself because without life there would be no death, therefore subconsciously they want to avoid reproduction, i.e. the potential of loss.