My sage flowered too this year!
It has traveled with us from place to place, each time growing a big root through the little holes in the bottom of its pot, which it enlarged, to send into the ground and each time letting me know it was happy in its new place with that bigger root to tap with. It showed me by growing big and healthy. Then, when I uprooted it at each move, as carefully as I could, it would show its lack of resource availability by dwindling until it again had the chance to grow happy at its new home. This move I was able to put it into the ground and toss the old clay pot it had been in since I'd gotten it, as the pot had gotten both outgrown and was starting to splinter from the force of the sage's growth within.
The sage's story has mirrored our own. It and a couple of raspberries were the only plants that made all the moves with us.
Herbs have been the one thing that I have always grown, since I started gardening. They tend to be humble in the sense that they can be grown in relatively small amounts of space without too much attention and in return give so much beauty plus flavour to food so I am not surprised that you have quite a few of them in your little balcony garden. They (and you) appear to have a great view from that balcony!
This is the first time it's flowered so I am really excited to see its gorgeous purple flowers