I was in the same situation 24 months ago.I bit the bullet and built my coupe complete in 18 mo.I had it running and road testing in 11 mo.AS for the gray hair,i don't have much,but mine is probably grayer than yours.There are a few of us on this forum almost old as dirt.I say go for it.I had a blast.WE will be here to help in any way.WELCOME