I'm just entering med school this summer (finally!) and still deciding which school is the best fit for my career goals, but I'll add a few tidbits from my experience:
1. If you feel called to the profession, don't get discouraged by others! Listen respectfully, reflect, but know your own strengths and weaknesses: what gives your daily work meaning, what frustrations you can live with, which annoyances you can't. Many, many people will tell you you're too old. If you've shadowed extensively, and, however sappy this may sound, still feel "called", don't let people who took the traditional path deter you about how old you'll be in residency. I had physicians at interview invites ask me what the heck a postbac was. My father (not a physician) told me to freeze my eggs before embarking on this path (I'm a nontrad who just turned 30 but has no children). I've had friends tell me maybe I should go back to my former career because it would be much easier and more financially stable. But, I've also had encouragement from mentors who entered medical school later in life and, in their second careers, have been able to heal others and change the course of people's lives.
2. Medical training, from premed, to the mcat, to residency, to fellowship, thrives on a culture of preparing for the next step. However, don't let that looming next step deter you from living as full a life as you can. There will always be a lot of stress in this field and learning early how to manage studying for the mcat while managing family obligations and personal responsibilities will help you (at least, from my limited experience) continue to grow and live and be there for the ones you love no matter what.