Do you think that adults are just bigger kids?

For the most part, kids and adults are not the same. Psychologically, and in terms of brain development, they're very different. Adults are capable of self-actualization, for one. Now if you're not a big fan of Maslow, there's also Erickson, who can detail some of the differences for you through various stages of life. Also, physiologically, the brain is very different structurally between childhood and adulthood. Turns out there's a structural reason that teenagers, for instance, feel fairly invincible and often tend toward recklessness. All that said, some adults act like children out of irresponsibility or whatever.

Or are kids just tiny adults?

Some people never grow up no matter how old they get.

That depends on the specific analogy you're trying to make. There are traits that are similar between kids and adults, and traits that are different. Are they exactly the same in every way besides one being older and bigger? No, not unless you get an exceptionally immature adult or an exceptionally mature child, but neither are they completely different. So it depends on the trait/s you're trying to compare.

yes.
just yes.

Yes we are i hate to behave it's so boring.

ONLY THE RICH ARE....

No, children are not capable of empathy and adults at least SHOULD be.

In a way we are all children, and in a way, we aren't.

adults arent kids bet

Its a tough one. You don't feel aged (except maybe on those especially challenging monday mornings after a crazy weekend) but your body continues to age physically around you. Although I suppose age can be measured in terms of experience and in that regard an adult is a long way past a kid.

Some adults definitely are just big babies. They haven't grown, learned from their mistakes/wised up. They continue to make stupid decisions, but now they have power-especially if they have kids and can ruin their lives.

My sister is in her 30s with kids and still thinks and acts like a teenager. She's always been a difficult person to deal with and has never changed.

Others do mature and are wiser, it comes down to the individual.

Fortunately for me I found a profession which allowed me to pretty much enjoy life as a kid, but was financially rewarding enough that I'm having a pretty good retirement.
I always say I grew older (66 now) but never had to grow up. My life has been a blast, without too much struggle (except to survive harrowing adventures), plenty of love, money and fun.
I wish you all just as great an adventure.
My motto; "Never a dull moment".

I guess they are bigger, technically. Question: How do you define 'child'?

an adult knows how to act in public

An adult is a learned child.

I kid.