A Narrow Enough Niche

I am a wealth coach helping busy working mothers to build wealth and create a financially secure future for themselves and their families so the niche I selected is Busy Working Mothers. Is that a narrow enough niche? Should I specify an age range for the mothers or the kids that they have? Also I only want to work with educated and motivated mothers who find it difficult to manage their personal finances and feel anxious but do have money coming in. How can I differentiate between working mothers who perhaps don’t have the money to spend and professional mothers who have good incomes and can pay for my services and need my help to get better with planning their money? My business name currently is Financially Secure Mothers. Thank you