I agree with @Arnorth24, if you sell it at this time, you only can get a low price or no more money from it, but if you can wait extra 10 or 20 years ago then everything will be different and you can get a high price if you sell it. Of course it is still available to use when you sell it.It's not that old that's why it's not that valuable if you sell it. But you could still try and look for a collector and maybe they could buy it for a small price. Or you could give it to me. Just kidding.Why not keep it? Put it on a time capsule. After how many years you could get it and remember your memories with it.
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Why the country will affect to what the OP should do?Depending what country you're based in, there are options - where I live there's a site called Gazelle that accepts phones. Where are you based? It might make it easier for me to offer suggestions if I know what country you're in.
I think the effort or money to maintain/keep it for 10 - 15 years later even more than the money you sell it.Save it for now and sell it some 10-15 years later. It will rake in some decent money.