PROBLEM TO BE SOLVED: To provide an aging retardant having sirtuin gene expression-enhancing action or IDO gene expression-inhibiting action and being useful for individual longevity and prevention/treatment of various diseases developing with aging and various diseases mediated by sirtuin or IDO.SOLUTION: There are provided a compound 1 and a compound 2. The compound 1 is (4aS,6aS,7S,11aR,11bS)-4,4,11b-trimethyl-7-hydroxy-1,2,3,4,4a,5,6,7,8,11,11a,11b-dodecahydro-6aH-cyclohepta [a] naphthalene-6a,9-dicarboaldehyde [common name: Galanal A] or Galanal B which is a 7R isomer thereof, or a mixture of these (including racemate). The compound 2 is (8S)-14,20-cyclolabdane-12,14(20)-diene-15,16-dial [common name: Mioganal].【課題】サーチュイン遺伝子発現増強作用又はIDO遺伝子発現抑制作用を有し、個体の寿命延長、並びに老化に伴い発症する各種疾患及びサーチュイン又はIDOが介在する各種疾患の予防/治療に有用な老化抑制剤の提供。【解決手段】化合物1又は化合物2。化合物1は、(4aS,6aS,7S,11aR,11bS)-4,4,11b-トリメチル-7-ヒドロキシ-1,2,3,4,4a,5,6,7,8,11,11a,11b-ドデカヒドロ-6aH-シクロヘプタ[a]ナフタレン-6a,9-ジカルボアルデヒド〔慣用名:ガラナールA(Galanal A)〕、若しくはその7R異性体であるガラナールB(Galanal B)、又はこれらの混合物(含むラセミ体)。化合物2は、(8S)-14,20-シクロラブダン-12,14(20)-ジエン-15,16-ジアール〔慣用名:ミョウガナール(Mioganal)〕。【選択図】なし