Treatment options for a 15 year old with unrestorable tooth?

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I have a 15-year old male that has presented with a fracture at the furcation of tooth #19 (man. left first molar), making it unrestorable. I have presented 2 treatment options, orthodontically relocate #18 into the position of #19, and #17 into #18’s position when it erupts, or bone graft and place an implant. Is 15 too young for an implant in this position? At what age would it be best? Patient and parents would rather not go through orthodontics again, which he finished last year. If I have to wait, I would extract, bone graft and place a fixed space maintainer. Thank you in advance for the replies.