Teeth Gap: Please Suggest On Options?

I am 27, Male. I have gap in my front teeth. I have consulted a orthodontics doctor. It was very basic examination. I was asked to get the X-rays and Models ( which cost around $400).
Secondly, my insurance doesn’t have ortho coverage and they told me treatment would cost as high as $5000. I have tried to get ortho coverage added to my insurance; looks like it was not possible with my existing group insurance.
Now, I am wandering around with the following questions ?
1. Is it really possible to get gaps closed at 27 ?
2. Are there any suggestions about the type of the treatment (should be inexpensive, since I can’t afford $5000 )?
3. Anyways, doctor said he would decide about treatment plan after the X-rays (spending like $400 on this).. Not sure what Doctor would say afterwards.
4. What would be the best possible solution to this problem with the given constraints.
Thanks.