You'd be surprised what people can do with very little information about people
@Duff Habits, routines and information are very powerful things to people who want them. And they will pay big money for pre-collated information like this, that is more or less trust worthy as people have inputted it themselves.
Example 1
Say I put down my age bracket of 48-50+ and gender is female. That would put me into the category of people who are likely to fall for various technology related scams. A bit closer to home, if someone can work out where I live then they could make a fair assessment as to how much force may be required to subdue me if they wanted to brake into my house.
Example 2
19-26 year old male. - This would put me in a range of people who normally can be easily seduced into giving more information. This can be in the form of coxing info via bragging rights, or giving away too much information about their job or routines.
Now, team age and gender along with profession and you can assume a lot more about a persons routine, and have a higher probability of getting it right.
Example 1
27-33 female. Profession - Nurse
Easy to assume that I work shifts, so out the house for long periods of time, that can normally be fitted into a scheduled.
Example 2
41-47 year old male. Profession - Legal admin
You can assume that I probably work a normal day in the office, but probably bring work home with me on a laptop or paper. With being older, you can assume that I would have more "clearance" in the company so I am probably privvy to more information than a junior member of staff.
From what I can see, these 4 questions are not required for the desired outcome of this survey (which is to make/better an airsoft site?).
To put it simply.
Just because you can collect information, does not mean that you should.