the mysteries of age

Simon and I were talking about Jules & Stefan coming to the beach with us this summer. Most of the discussion was focused on how they can be 2 years older than him now (ie they're 6, he's 4), but when we get to the beach they'll only be 1 year older then him (ie they'll still be 6, he'll be 5). Complex math is demonstrated and processed using various calculating devices, calendars, etc.

Then he starts focusing on how they were born in the same year, and how they are twins.

We move on to discussing what year other people were born.

Simon: When was Uncle David born?
me: 1976.
Simon: when was Aunt Marnie born?
me: 1976.
Simon: [deep in thought] so they're twins, too!!!