My 11 year old is not into hiking and the trail to the falls was short, easy and fun for her. It is less than 5 minutes and not steep.
There are lots of stair/steps, and we saw a few couples with babies (in backpacks/bjornes etc). Agree with above response that most kids will be ok on the trails, and the first 10-15 mins is mostly flat, along the lake, so you can always test it there.
Parts are kid-friendly. It really depends on their ages and abilities.
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