Usually anyone younger than 8 will struggle to paddle their own kayak or SUP. But we have some big double kayaks that younger kids can accompany parents on, so the littler ones are not excluded. The smallest size wetsuit (essential piece of kit) is for age 5+ so we can't accommodate younger unless you have your own. Just remember, except for kids clubs and kids-only summer events, a parent/guardian must accompany the child on the activity.
For cycling, we keep trailers and toddler seats so kids from 18 months+ can accompany their parent or guardian.
We do not hire equipment to anyone under 18 unless they are with a parent or guardian.