Welcome to the 50+. Overall good advice so far. You might want to check out the sub forum on bike fit. Fit can make or break your riding experience. But unless you've got unlimited resources, ride what you've got to learn more about what you like & don't like.
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A conclusion is the place where you got tired of thinking. - S. Wright
Favorite rides in the stable: Indy Fab CJ Ti - Colnago MXL - S-Works Roubaix - Habanero Team Issue - Jamis Eclipse carbon/831