erica popson is all of 21 years old, yet in the world of women’s amateur golf, where having a driver’s license seems a lot like carrying an aarp card lately, that qualifies her as an aging veteran. so it was that the davenport, fla., resident’s one-stroke win sunday at the 58th Harder Hall invitational constituted a triumph of maturity over, well, middle school. playing in the final group with 13-year-old mika liu, the leader after the first three rounds, popson watched her eighth-grader opponent drop a lengthy birdie putt on the last hole at Harder Hall cc in sebring, fla., to reach five-under 283. undaunted, popson proceeded to roll in her own eight-foot birdie try to close with a 68 and a six-under 282. although she had won five career college tournaments at tennessee and built a résumé that helped her earn a spot on last year’s u.s. curtis cup squad, the all-american had yet to claim victory in a national amateur event. a year removed from surgery to remedy a nagging thumb injury and with the final semester of her senior season awaiting before she turns pro, popson looks ready to close out her amateur career by proving a point: she’s not just getting older, she’s getting better.