Hey Surabhi,
Men over 50 can be more fitter than any guy at 20"s and 30"s. Any exercise routine can for an individual totally depends on your current fitness level, weight, BMR, BMI, Health condition, etc. Depending on these factors we can customize your exercises routine. If you are a beginner then just start with normal brisk walking, jogging, skipping, etc. As these are all low to moderate exercises to start.