Criminals, too, are going to know what you are about. Don't kid yourself thinking you can make yourself invisible to people who make their living on taking advantage of the weak. You can be young or old, male or female, in a van or in a house, and what matters most is if you present yourself as weak not less visible. Of course being less conspicuous is going to help, but being seen as someone who isn't weak will help keep you safer.
A study was done with hardened criminals that were still locked up and they were given a video showing various people walking. The criminals were then told to say which people they would attack and which ones they would leave alone. They were remarkably consistent in their ability to identify weaker prey. That's the mindset of a predator. Just like a wolf will instinctively know which of their prey is the weakest. We can't see it and it seems amazing to us that they can know such a thing. When we walk by a house or a van, we see a house or a van. When a criminal walks by he/she sees a window cracked open, a broken street light, a hedge that conveniently provides cover, etc.
If you want to be stealth, you can park behind a tall hedge in the shadows which will keep the neighbors from seeing you, but that same environment will put you at a disadvantage with a bad guy.