To create a different aged dragon, do you essentially build a new monster? In Pathfinder it gave different stats for different age categories, and IIRC most modifications were just done through templates (usually).
Yes, you take the base stats and graft for color and rebuild based on age and associated CR.
After hatching from large eggs, dragons mature through 12 age categories: wyrmling (CR 3—4), very young (CR 5—6), young (CR 7–8), juvenile (CR 9—10), young adult (CR 11—12), adult (CR 13—14), mature adult (CR 15—16), old (CR 17—18), very old (CR 19—20), ancient (CR 21—22), wyrm (CR 23—24), and great wyrm (CR 25).
Note that higher CR creatures should have more special abilities (listed on the tables in the back of AA), and you'd have to homebrew those if you don't just leave them out or maybe replace with class graft abilities. Pathfinder dragons would be a good source of additional abilities for older dragons.
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To add to Xenocrat, Pathfinder also has many of the void and space dragons that you might want to mine for Starfinder so look up some of their abilities and quirks as well.