Patentcad good luck with surgery. You should do well as most do.
metalheart thanks for your post. You are probably right about individual biology. Having lost a spouse 13 years ago, marrying a wonderful talented lady, moving to Florida and starting biking at a late age, my attitude is to go for it and not live in fear. Learned the hard way tomorrow may never come and better to take and enjoy each day at a time. YMMV