C.G.
You are doing a wonderful job and it sounds like you are doing everything right! (nursing on demand, cutting back slowly, etc) I pumped at work until my son was 14 months old. I cut back to once a day around a year and then cut it out completely at 14 months. My son still nurses before bed and before naps when I am with him and some mornings (3 times a day tops). I still have a supply and he is 21 months now. Just take it slow and follow your body's cues. If you get engorged at all, just pump enough to release the pressure. Good luck and congrats on doing so well!!