I also voted no. There is a lot of good info out there with great workouts. most current training routines require you to have more rest days as we now understand more about the healing process of muscle tissue. At 50 your body needs even more time to recover from training than it did at 20. You can always improve your body- at any age, as long as you train smart. Train hard, tear it up good, enjoy your off days and you'll stay motivated to continue working out.