Go with your instincts.
There is no reason to do it at an arbitrary age.
When I had my first I planned on nursing 6 mos and weaning to formula and a bottle.
6 mos came and went and neither of us were ready.
At a year she still seemed so little and dependent on nursing. Same at 18 mos. We didn't nurse outside the house past 15-16 mos though.
She ended up nursing till a month past her 4 th birthday when I gently pushed weaning.
Nursing I found is an amazing reset button for the frustrations of toddlerhood.