Simon Pegg -- Good Genes or Good Docs?

Simon Pegg's good looks are out of this world.

Here's a 34-year-old version of the "Star Trek" actor showing off his blonde locks in 2004 (left) and 14 years later ... the now 48-year-old star is seen at a premiere for his new film "Ready Player One" earlier this week (right).

He's got that hot fuzz.

The question is ...