! This is a hobby I share with my son as well. Using a loupe will help with the eye strain. I prefer 10x, my husband prefers 15x to 20x. They should not be more than $20 (mine was $12) and we got ours through Wizard Coin Supply.
I started with my son when he as 6'ish and he is now 13. My son's interest decreases for awhile but he always drifts back to it. The one thing that keeps him interested is taking him to local coin shows. Usually dealers at shows will spend extra time with young collectors if they are not super busy and my son has received plenty of fun stuff for free from them.
I hope this turns into a fun hobby for the both of you!
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