Do I need a niche for offering general life coaching?

I want to start my business as a coach and I want to offer general life coaching.
I did my certification in a coaching style that is less focused on teaching specific topics or tools and more on helping people shift their mindset and life through asking questions, so that they can discover that the solution is in themselves.
Should I niche down? How can I offer general life coaching but with a niche (would life coaching for women between 20 and 35 be considered a niche)?