신체 나이에 기반한 새로운 나이 체계를 도입하려면 두 가지 난관을 넘어야 한다. ‘표준화된 지표’를 만들 수 있는지와 ‘사회적 합의’를 얻을 수 있느냐다. 현재 사용하는 출생 연도 및 날짜는 객관적 역사 기록이다. 이와 유사한 수준의 형식상 객관성을 갖춘 시스템을 찾기 어려운 것 역시 사실이다. 향후 출생 연도를 대체할 만한 객관적이고 표준적인 나이 지표를 설계할 수 있을지가 중요해질 전망이다. 관련 법 제정 역시 필수적이다. 

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