Reddit reviews A Crack in Creation: Gene Editing and the Unthinkable Power to Control Evolution

Google around, find websites for university degree programs in biology, biochemistry, genetics, etc., and mine the syllabi for textbooks that are used. That would probably give you a decent seed list.

Read popular books for lay-people on biohacking and related topics, like Biopunk, Frankenstein's Cat, Regenesis, Life at the Speed of Light, A Crack in Creation, etc., and then use Google / Wikipedia to drill down on the topics you find discussed there.

One other book that has been recommended to me by actual experts from our local biohacking group is Molecular Biology of the Cell

Also.. It's fully possible for humans to create a mix that stops aging in whatever age someone is in? In theory?

I don't think anybody knows the answer to that yet.

A random selection of non-fiction recommendations for /u/MindOfMetalAndWheels:

• A Crack in Creation, by Jennifer Doudna
  
• Debt: The First 5000 Years, by David Graeber
  
• One Good Turn, by Witold Rybczynski
  
• The Drunkard's Walk, by Leonard Mlodinow
  
• The Professor and the Madman, by Simon Winchester
  
• The Secret Lives of Colour, by Kassia St Clair
  
• The Storm Before the Storm, by Mike Duncan
  
• Gentlemen's Blood, by Barbara Holland