Let's face it, at 67 you aren't getting any stronger. Get a GRX crank and a couple of sets of chainrings. Then leave the smaller set on there because that's all you really need.
I did an SR series using a crank with 42 and 28 tooth chainrings. The 600km ride involved some relatively spirited group riding, and I never wanted a bigger gear than the 42-11. 42-11 is a bigger gear than the 52-14 top gear that was common when you were a teenager.
Last edited by unterhausen; 01-02-22 at 10:22 AM.