Board Thread:General Discussion/@comment-26811160-20151220053636/@comment-24582276-20151220102239

My theory: In the fragment of "The Tale of Two Stans" it says "Now, we are going back 50 years from today". 50 years back today is the year that Stan twins are playing on Glass Shard Beach,NJ and they explored that little cave in that time. So that year is 1962. Probably, the Stan twins were 12 years old in that time, which is the current age of Dipper&Mabel because that same age will give story a strong detail. So, if they were 12 in 1962 that means they born on 1950.

So, they are like 62 years old now.