Earning Staged Activity Badges can start at the very beginning of the young persons Scouting journey e.g. in Beaver Scouts. Once a Staged Activity Badge has been earned, it stays with them throughout their time in Scouts e.g. all the way up to Explorer Scouts. Staged Activity Badges have multiple achievement levels per badge: a Beaver Scout or a Cub Scout may only be able to achieve Stage 1 of a badge due to the challenge or complexity whereas an Explorer Scout maybe able to achieve the highest stage possible.
The level a young person earns and how they earn it is decided by the leader, while making allowances for ability.