It's not only observational bias, because there's actually a whole field of genius research that has documented the fact that, if we look at the people we admire from the past and then look at what age they made their biggest contribution, whether that's music, whether that's science, whether that's engineering, most of them tend to do so in their 20s, 30s, early 40s at most.
Ini bukan hanya bias observasional, karena sesungguhnya ada bidang penelitian jenius yang mendokumentasikan fakta bahwa, jika kita melihat orang-orang yang kita kagumi di masa lalu dan pada umur berapa mereka  memberikan kontribusi terbesar mereka, baik dalam bidang musik, ilmu pengetahuan, tehnik, kebanyakan berkontribusi pada usia 20-an, 30-an, paling lambat awal 40-an.