Depends on the genes. Steven Adams, OKC Thunder basketball player, has a full mustache and beard and he's only 23 from New Zealand. I wouldn't say it's out of the realm of possibility.
Regardless, it's an interview from 2005 that was rediscovered that ultimately is something interesting that Miyamoto mentioned. Two years later, Mario Galaxy and New Super Mario Bros. came about and things went well for Miyamoto and Co. during that time.







