Killer age in slasher horror films

In The Texas chainsaw massacre the killer is middle aged and is called 'leather face'. This is because he wears a leather mask on his face to disguise his identity. This is a common convention of a slasher film for the killer to be of this age.



Another slasher film that has a middle aged killer is 'My bloody Valentine'. As shown below, again this conforms to common conventions of a slasher genre by having a middle age killer.



Throughout of the film the killer wears a gas mask over his face so that you can't see his identity till the end of the film when it is revealed.

Finally, in the film 'Hatchet' the killer is also middle aged as shown in the picture below, therefore conforms to common conventions of a slasher genre.