Well how about Greg in the first Brady reunion movie. He's already a doctor.

Maybe it was graduate school she was in?

By the time child #6 is ready to go to college, most parents would be tired of any struggle the kid puts up, so they're more than happy to let them take their time finishing school.
Also, most parents have more money by then.
So Cindy not graduating till age 25 makes sense.

Another thing was that Cindy had all this education only to become a radio DJ? What did she major in, Theater, Communications?

Perhaps she was in graduate school? I remember her saying she was graduating but no indication wether it was undergraduate or graduate school or say anything about how old she was.

It's perfectly conceivable that Cindy changed majors. In
The Brady Brides
she's a theater major, but by the time
The Bradys
came along in 1990 she is working as a DJ. She might have gone for a couple years, tried acting which didn't work out, went back and majored in Communications or Radio/TV.

The original series was usually very approximate about the ages of the Brady kids.
In high school if you have a pulse and show up almost every day you will get a diploma at the end of four years. College is much different. If you have poor grades, transfer schools and/or change majors that can set you back. A lot of people need an extra semester or two to finish their degree. There is no shame in that as long as you graduate. Many students have been on the "five year plan". Cindy was on the ten year plan.

The important thing is that you graduated. It blows my mind when people invest four years or more in a college education then quit and walk away with nothing.

I guess I'm one of those geezers, because I graduated college when I was 28 almost four years ago. But I don't remember Cindy being dumb during the series. She was always in the same grade as Bobby. Some people start college late or take breaks for a couple of years in between, regardless of how intelligent they are.
Let's get dangerous!

They were usually approximate about ages on the original series. Yes, Cindy was a little old to be an undergraduate. But she always was a bit of a dumba$$. She may have attended college part time or even not attended for a few years. I was only 21 years old when I graduated college. But many classmates I graduated with were much older. Colleges now refer to students over 25 as "non-traditional". When I was in school we called them geezers or grayheads.

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Okay, can anyone answer if they actually mentioned in the movie that CIndy was 22?? I have the movie on VHS (I really wish they'd come out with this on DVD), so I'll have to try to track it down (all of remaining VHS tapes are put away since most movies I had before on VHS have now been replaced by the DVD version) and find out, but if anyone can answer this it would be appreciated!

Maybe she was going to graduate school.

I don't think Math is a problem in this show. You are just assuming that Bobby and Cindy followed the "traditional" path of college. Who says that Cindy even went to college straight through? Maybe she transferred a couple of times or changed her major? It makes sense that she would be going away to college in 1981, during the Brady Brides, which would make her 18 (considering she was 6 during the first season). Maybe she took some time off in between to figure out what she was doing. Not everyone graduates college when they are 22. Graduating at 25 is completely and entirely possible and acceptable. I also don't remember any mention of Cindy's age during that movie.
Also, dfortier5, you made a comment about graduating in mid-year. Most colleges and universities have graduations after each semester, so it's very possible that she could be graduating in December, after the Fall Semester.
The same thing can be said about Bobby regarding his age and still being in school. I think they made a reference to him being in grad school, which is entirely possible at the age of 26.
So, there really is no math problem with the Brady's, unless you consider Mike saying that they've been married for 20 years instead of 19. Maybe they started filming that pilot (or wrote the script) in 1968 and it aired in 1969. It's not a big deal.

Yes, Bobby was supposed to be in grad school for his business degree

Wasn't Bobby supposed to be in grad school rather than regular college? I agree the age thing with Cindy is a problem, but I seem to recall they mentioned Bobby's graduate courses or something.

Math is definitely a problem with the Bradys. In 1981 when The Brady Brides came out, the very first scene is when Mike and Carol arrive home after dropping Cindy to college for the first time. Then in A Very Brady Christmas, 7 years later, Cindy is graduating, mid-year to boot. (I dont understand that one.) Worse yet, Mike and Carol think that Bobby is also graduating. Bobby was 26 years old and still in college just to do accounting and business management? Either he failed a few years or he had another major before this. At 26 he decides he wants to be a race-car driver? Late bloomer indeed!
In the Christmas show of the first season of The Brady Bunch (1969) Cindy says she's 6 years old. That means that in A Very Brady Christmas she graduated collage at age 25. People say on this board that they said in A Very Brady Christmas that she was 22 years old. I've watched A Very Brady Christmas every year since 1988 (sometimes twice a year) and I have never noticed they mention Cindy's age. Can someone please tell me specifically where in the movie that Cindy's age is mentioned?
Also, when Mike starts his speech he says that Carol and he have been married 20 years. Carol and Mike married in 1969 so in December 1988 they had been married only 19 years!
Yes I agree, the writers do not know how to add.

Was it actually mentioned in the movie that she was only 22??

If I were Bobby, I would be clinging to the idea that Cindy was not my real sister. Nice Kitty Karryall-toting sis become hottie Jennifer Runyun. And what ever became of Runyun, by the way?
I actually only watched this because of Runyon, but I quite enjoyed it even if it was very silly.
R.I.P. Rick Ducommun and Tony Longo

Did they say that Cindy was only 22 in this movie or are people just assuming that? Obviously if they did, it is a major goof on the part of the filmmakers. If not, then it is perfectly realistic that she could still be in college at 25.
For Cindy to be in college during Brady Brides (1981), she would've had to have been at least 18. That means she was born in 1963 and was 6 when the original show aired. That would put her at 25 during A Very Brady Christmas. It is realistic (although not necessarily normal) that she could still be in college 7 years later. Maybe during that time she dropped out for a while, traveled overseas, changed schools, changed majors, etc.

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If I were Bobby, I would be clinging to the idea that Cindy was not my real sister. Nice Kitty Karryall-toting sis become hottie Jennifer Runyun. And what ever became of Runyun, by the way?

I agree Queenies Art, my math came out the same as yours! Mike Brady even made reference to the "20 years ago we bacame a family" in the beginning of his Xmas dinner speech.

My big problem with math in this movie was this:
If Carol and Mike are celebrating their 20th wedding anniversary, and Cindy was 5 years old (give or take) when they got married, how is she 21 or 22 and just graduating college now?