How much of an age gap is there between your little ones?

My older daughter is 6.5 years older than my son. When I was pregnant, I was pretty concerned that they wouldn't bond because of the age gap but I was so wrong! My son when he was in my tummy, he wouldn't start kicking me rapidly each time his sister was around me. Now that he's out, he gets overly excited everytime she's with him. She doesn't have to do anything. Sometimes I get her to JUST sit next to her brother and my son would stop cry and start squealing. My daughter on the hand is a very typical older sister. She plays with her brother all the time, reads to him and even scolds him e.g. she would say "cannot smack Kakak must sayang!" It's very endearing to see the two together.