You have to be above 13 years old to be a Blackcard member's guest or to obtain the non-reciprocal membership. Minors require an adult to be present.
You must be 16+ to have the blackcard membership, but you will not be able to bring a guest unless they are 18+
You have to be 18 years or older or you can be 16 or 17 with your parent permission and a signature.
It depends on what gym. Different gyms have different joining ages, just go down to your local gym and ask them how old you have to be to join.
any age
Old Gym was created in 1893.
I think there is an appropriate exercise equipment for those people who want to exercise in a gym. From teenagers to adults, the teenagers are not allowed to use the gym equipment of adults because it might affect to their body and cause pain.
any
The ice gym leader
nothing, that is the 16 gym the 15 gym is at seafoam islands
The Gym in Blackthorn City. The gym's special Pokemon type is dragon. After you beat the gym you can use waterfall
You can be as old as you want but you have to be at least 16 or older to work out at a gym like the world gym in Fayette and Peachtree City
you need to beat the 4th gym and you get it from warden the old man in fuchsia city to the right of the Pokemon Center by giving him the gold teeth from the safari zone
canalave city...
you have to use the HM surf and surf behind the gym and go in the cave. go to the other side of the dragon temple and go in. awnser the old man's questions and the gym leader will come in and give you the badge. This is to get the 8th Johto gym badge. To get the Kanto one search: how do you get to the 8th Kanto gym badge
Gym
First gym: Rock type. Use Water. Second Gym: Fighting type. Use Flying or Psychic. Third Gym: Electric type. Use Ground. Fourth Gym: Fire type. Use Ground or Water. Fifth Gym: Normal type. Use Fighting. Sixth Gym: Flying type. Use Ice or Electric. Seventh Gym: Duel Rock/Psychic types (it's a Double Battle). Handle with Water and/or Dark/Ghost types. Eighth Gym: Water type. Use Electric or Grass. Good luck.