weaning?

I've been thinking about weaning Oona for awhile. She's 16 months old - too old according to some and too young according to others. She's always been a bit of a chomper and nursing has been more uncomfortable/annoying for me than it has been great for the past couple months. Teeth indentations, you know. The question has always been when and do I have energy for the fallout. Well... She just went to sleep without nursing. Maybe this is the time? Thinking that makes me feel sad about already having had our last nursing session (four in the morning this morning) and then I remembered how grumpy I was at four this morning only wanting to be asleep. Is it time?