If else condition with date

Hi guys so I have post and comment system, So I want to show comment section if the day of the post +7 days. if they see the post on day 8 of the post created they can't comment. Here is my code that I try but I still dont get it :

 @if($comment['created_at'] <= 7)
                    <a href="" class="btn orange-button">comment section</a>
                @elseif($comment['created_at'] >7)
                    <a href="" class="btn orange-button">Can't comment</a>
                @else
                    <span class="badge bg-pink">Hello</span>
                @endif

I know it's totally a dumb code, hope you guys can help me I'm still learning here