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You could try "Tabata" Workouts. Probably google it is best, but I'll try to explain. It's like you 55's kinda. You can use any excercise you want. Running, biking, push-ups, pull ups, squats, sit ups, sprints.............the list goes on. Basically it's 20seconds of work then 10sec of rest...

Bonner1040 beat me to it. Crossfit is great for anyone of any age/size/ability. You may also want to try some omega 3 fish oil tablets to help with any joint pain and with recovery.