Twin little monkeys out about the town

When I was pregnant, I worried that the boys would look so much alike that I wouldn't be able to tell who was who.  We knew they were fraternal, but still...what if all I had to go on was that one had darker hair - and they started out bald?!  Lucky us, they came out looking like brothers, but other than when totally sleep deprived, easy to tell apart. When the boys were tiny (like 3-4 months old), I was part of a local twins club.  Now and then, I'd read about twin moms fighting schools, school districts, their states about whether twins should be allowed to be in the same classroom, or should be automatically separated.  So now, I could worry on that a little.  Should I fight to keep them together?  Encourage their individuality and independence?  At what age?  Then one day, I met an adult who was a twin.  He told me that he and his brother had grown up "not as close as twins usually are" because they were in different grades.  So that became my biggest worry.