Sometimes twins are separated at birth and only meet again when they are grown up. Even so, they sometimes make choices in life which are strangely similar. One pair only met each other after 40 years apart and found that their wives had the same name. And so did their children and their pets!
Is there a difference between being physically identical and only being born on the same day? I knew a pair of non-identical twins when I was a boy. They were proud to be completely different from each other. One was very short-sighted from an early age and wore glasses. He picked up the local accent and was obsessed with trains. His brother spoke with a posh accent and was very musical. The first became a train driver and moved to Scotland. His brother went to a music college in London and became a concert pianist.
I have recently been the teacher of two pairs of identical twins - I often have difficulty telling which is which. Luckily they don’t seem to mind. One day, I gave them a list of questions to see what they felt about being so close. Each twin answered the questions in a separate room.