When l started to read your post, l thought oh these guys are trying to pick her up with these tired lines. But you're right its personal and annoying at times. Since your sons live with you thats good they can watch out for you.
When l get asked that question l always lie and say l'm still married... but l'm divorced it just annoying at times. Could it be they want to get to know you to date or something.
l mean its possible.