They'll be 6 and 4. My 4-year-old will climb until he’s worn out, then he can ride on my shoulders. My 6-year-old, on the other hand, seems to have endless energy. On some of my longer run he will ride his bike up and down the hills with me the whole time.
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Sounds like the are good to go then! The altitude difference is the only thing I would be worried about at that point.