How do you explain "Time" to a 4 yr old?

For the last week, we've had recurring "episodes" of "I don't want to be 4 yrs old" from our precious No 1. We then had to enter into a lengthy talk of how each year...one grows older... from 4 to 5 to 6... "But when I become 5, I will be in cheh-cheh Rachel's class but she'll be 6 and will go to another class! Wahhh! Sniff!", wails Letitia.

I will offer anybody chocolates...if you can come to terms with the above dilemma and the explain to me...how to resolve the matter. My Letitia has been waiting a loooong time to turn 4. Why? So that she can go to PREP at big children's school. One of the many "big children" that she longs to be in the same class with is "cheh-cheh Rachel" from our Fortnightly Bible study group. To her dismay, she now sees this CC in the same school yard but with cooler bigger kids and not at all in her class (the CLASS concept is another of our battles!). "Why can't I be in her class when I turn 5???" Someone please explain?

Letitia's had a week of PREP and is into her 2nd week. She told me that a little boy keeps kicking her when it's quiet time and she doesn't like him. I told her to either tell the teacher and the teacher will deal with him. Today, she told me that the boy "listened to her" when she asked him to be nice. Phew!! I was just about to send in the SWAT team.... nobody messes with my girls....not yet, not ever!! (hehe!)

Mathena's enjoyed (at least I have) the 2 days of mommy-mathena days while L's in school. She sleeps better but never enough as I have to wake her to go pick up her sis! I get to do "activities" one on one with her and just "melt" while I stare and sigh! (Watching her grow as the seconds go by). She is now a strong willed and openly "challenging" monkey. She is quite tough skinned but loves life to the fullest. She seems to think that her role in our family is to be the "courtjester". She deliberately tumbles just to get a reaction, she'll hide her face in any cloth (floor mat??) to play "peek-a-boo"! and she'll even laugh "ha-ha-harrr" like a pirate when we are all quiet! We love her to bits!