While I have not left for training yet (I leave for COT in a little over a week!) I have been married to a service member while working as a civilian nurse and we have 2 kids. I cannot speak for the experience of being the service member during a deployment, but as the family left behind it can be very difficult. If your spouse stays at home, things like child care will be much easier. I worked and went to school during the 3 deployments my spouse has been on. I found that my instructors at school were more understanding (as much as they could be in nursing school) but it is often difficult for my work to understand that as the sole parent, I am the only one here for every sick day/doctor's appointment/early dismissal/inservice day. I had to find a lot of additional childcare, which required a lot more money allocated for that. Sometimes I had family/friends to help, but they cannot stop what they are doing for months at a time to accommodate all our needs. I had many back up plans. BONUS: I have more refined planning and organization skills:) Also, my spouse never received more than 3 weeks notice for a deployment. We keep back up plans in place even when a deployment is not imminent because it seems like his come out of no where for us. I also found there was a significant amount of stress when we moved about finding a job. Because I am a nurse, I had to pay for licensure and sometimes found it difficult to find openings in the area of nursing I have experience in. Finding a place to live and lining that up with the kind of school we want our kids to attend has also been another challenge. Sometimes the distance is too great between our current location and our next assignment to allow for a house hunting visit. This can make moving a bit intimidating!
I am not saying all these negatives to dissuade you from service, but there are a lot of difficulties that come with this lifestyle and planning ahead and acknowledging the challenges can make you better prepared. We enjoy what we have and want to keep this going, else I wouldn't have applied to go in myself:) As other people have stated, you are nowhere near the age cutoff for active duty. But I think sometimes it helps to hear just how much planning and accommodating is required.