Axel Kei, 14, inks two-year deal with Real Salt Lake to become MLS' youngest signee ever | CBS Sports Headlines Axel Kei, 14, inks two-year deal with Real Salt Lake to become MLS' youngest signee ever Last year, Kei became the youngest to ever play in a U.S. professional sports … Continue reading Axel Kei, 14, inks two-year deal with Real Salt Lake to become MLS' youngest signee ever