According to Leif's SimDNA in SimPE, his hair was red before it turned grey. According to his age data, he had 28 days left in the elder life stage before dying of old age, which hints that he had access to the Elixir of Life at some point during his life. His granddaughter Erin Singles most likely inherited her green eyes from him, because neither of her parents have green eyes. Even though Leif had brown eyes in his thumbnail, his eyes are actually green. The reason for this is because he has a corrupted face.