It probably isn’t recommended again because of the pain, not because of age.
It’s used often for teens because teens aren’t exactly known for being responsible. Can’t forget a dose if it’s implanted. And IUDs are… less comfortable to get installed. Not that the other options aren’t on the table, but the long acting ones are often recommended first.
As for location there are multiple locations that -may- work, but medical trials are done with the implant in a specific location. To get an alternative site means you are doing a medical study for approval, which isn’t worth the funding for the companies that make the implants.
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