If you don't want to, you don't have to. 
Louise, my 1st, weaned at 15 months. She wasn't really asking any more, so I stopped offering and that was it. TBH I cried buckets. There would have been no harm in keeping going for a while, but I guess peer pressure got the better of me, sadly. Having said that she was fine and never asked again. I avoided the situation where she would expect a BFeed, like lazying around in my bed. I would get up as soon as she was awake. She never looked back.
But as I say, if both of you enjoy it, why stop?
My 8 months old is BFed and I will stop when we are both good and ready.
Best of luck.