1. A human becomin' old.

Correct.

Oh boy! I love riddles!

1. A human. Four legs when they crawl, two when the walk upright, and three when they have a cane.

2. Some friends were in a Hot air balloon, and the wait was to much, so it was going down. They dropped some of the sand bags to lighten the load, but that didn't work, so they took off their clothes, when that didn't work either, they drew straws, and the man they found, had drawn the shortest straw.

3. They had been playing poker, thus the bicycles were on the backs of the cards, and the two men got mad at, and killed, the third man for cheating.

Good, good..... Now explain the hooks on the wall.

The hooks were where their coats had been?

No. Pay attention to the first bit of the second sentance.

They had been in there when the rain started flooding the house?

Yes. But what about the hooks...?

2. Three people were in a hot air balloon when the weight was going to make them crash, so they untie sandbags and take off their clothes. When this didn't work, they picked straws, and the guy had the shortest straw so he was thrown overboard.

3. Adding on to what DoD said, they used the hooks to get out through the chimney?

No. Think about how I described the two men, and how the house was flooded....