Kanye West -- Good Genes or Good Docs?

Kanye West has got his good looks on lockdown.

Here’s a 26-year-old version of the Chicago bred rapper at a festival in 2004 (left) and 13 years later ... the freestyle phenomenon and dad of two -- who celebrated his 39th birthday earlier this week -- backstage at the Summer Jam Concert last weekend (right).

Welcome to the good life!

The question is...