Do you have to be 13 to play magic the gathering?

Answer 1

No, all that is required is good reading comprehension skills

Profesional tournaments however may be age restricted, but that has nothing to do with playing for fun with friends or at home.

The box/packs do say '13+' this is likely do to a few things; the aforementioned reading comprehension level, but also the arithmetic involved would make it less enjoyable for younger audiences. It should also be mentioned that there is a darker aspect to the 'flavor' of the game that might not be suitable for some audiences.

Answer 2

No