Skateboard
Skateboarding, if you just stick to whats comfortable at your level. Generally skaters don't do anything that involves going upside down, which can break your neck if done wrongly, and is just foot and board control.
this doesn't make sense you should probly stop skateboarding.
I did parkour yesterday. I am doing parkour today. I will be doing parkour later on today.
Any and all season(s).
The definition of parkour is individualistic, practitioners of parkour define parkour in their own way. However, all people can agree parkour is the freedom of movement.
You should not be wearing any gloves.
David Belle is the founder of parkour, but no one 'made' parkour.
A posse
If you are interested in skateboarding, then yes.
I would not rely on just watching parkour videos to learn parkour from. You have to be in tip-top shape to do parkour. You do not want to break anything.
Parkour can be start by run.
there are no age limits in parkour