Nah, you can start gym/intense excercise anytime, I started about... 31? Major imporovement in about everything, including sex (you don't get tired so easily for example). There is no "too late" age.
As for losing muscles - our bodies run in "least necessary amount needed" mode, since muscles are nutritient-hungry to sustain if not needed. You need to constantly push them to even sustain your level of strength/endurance. If I stop all my activities for 2 weeks, you feel horribly weak when coming back. Marathon runner could write books about it :)
As for losing muscles - our bodies run in "least necessary amount needed" mode, since muscles are nutritient-hungry to sustain if not needed. You need to constantly push them to even sustain your level of strength/endurance. If I stop all my activities for 2 weeks, you feel horribly weak when coming back. Marathon runner could write books about it :)