Older sister by the same age range as yourself, OP. As kids we fought, when she made it to college we became closer, when she entered adulthood things got strained as she and my family did not approve of my SO (they were right, she was terrible), and once we were both adults we are friendly. We don’t really have much in common as she very much lives a “Leave It To Beaver” type life (kids, house in the burbs, stay at home mom) and my SO and I are DINKs, do extreme sports like rock climbing and backcountry ski/splitboard, and have no plans to have kids (vasectomy on the horizon). So we keep in touch but don’t connect on a lot of things besides our shared family members / updates on my nephews