Birthday date time coincidence

I was in a long term relationship and met my boyfriend's brother's girlfriend for the first time one Christmas. We got talking and realised that we shared the same birthday. Not only the same date, but the same year and the same birth time 23.45.. Her mum was there and verified the time. We played a few board games that day, and often called out exactly the same answers.. We then discovered that although we met on the Kent coast, we had both been born in London, only a few miles apart. We had both worked in Belgium in our late teens. She had been a nanny / au pair in Belgium for the english man who had taught me english A level in evening classes in the UK. I meet a lot of people with the same birthday as me.