@LaviniasBigBloomers , you're probably right. As well as being invisible, no-one suspects us of being up to no good either.
I visit different companies for work and within the last few months, gained access to fairly secure sites on more than one occasion without the correct credentials in a way that a 20 something man probably never would have been allowed.
Once I didn't have the right ID, was still allowed in, another time, I forgot who I was going to see and just about made a name up on the spot and got in (eg I was supposed to be seeing John Smith, but had forgotten to write it down, asked for James Stewart by mistake, no-one of that name they said, then the security guard started reading names of everyone who worked there until I recognised the right one), that sort of thing.