I think it would be fine for the 14 year old and for the younger one I would dull the knife blade as it is very sharp.
I think a Micra is a great gift for a responsible, mechanically-inclined 14-year old. As for a 7-year old, it depends. If it is their first knife, I would go with something simpler, with a larger handle (for a better grip) and a locking blade (if legally permissible in their area). An Opinel No.7 "My First Opinel" would be a good first knife. On the other hand, the design of the Micra prevents the blade from closing on one's fingers (the kick of the blade will hit the end of the opposite handle first); it's better than the Leatherman Squirt PS4 in that regard. And there isn't really enough spring tension to cause the blade to snap closed on one's fingers. Just make sure the child knows not to take it to school!I guess I'm saying that the Micra isn't ideal as a child's first knife, but it is safer than most slipjoint knives for a child who is familiar with knives.
Yes for the older one. As you describe the younger one I'd also be inclined to say yes. My only hesitation is the Micras inner tools. They would both need some instruction as those inner tools can fold on them. Unlike scissors they would be used to the inner working of tools on a Micra IMO would require instruction.
Too bad Leatherman discontinued the Leap as it was specifically designed for kids.
after seeing your post, i googled the Leap. It seems like a micra except with a saw instead of blade. is my assessment correct?