The climbing park in Rotterdam has 7 different courses in living trees ranging in various heights and levels of difficulty. Climbing may take up to 3 hours max (including instruction), but you can choose to shorten this time. The climbing park is interesting for young and old people, between ages of 7 (length 1.20m) and 80 years old. For the smallest monkeys there’s a free playwood.
https://en.rotterdam.info/locations/klimpark-fun-forest-rotterdam/