Age gap, starting a family, and career

Me and my man are 13 years apart. Ill be 26 monday and he just made 39 a week ago. We have been together over 4 years. Wanting to start a family and get married. With his age and health issues he's like now because honestly who wants to work hard in their 60s still rasing and taking care of kids. Im like ready now but then im thinking about my career and how to balance it all without losing myself as a mom. Advice?