That is very close to my commute distance, and I ride 3-4 days/week year round. I'm 61, so it should be very doable at your age. Getting a road, cross or touring bike with decent tires would help your cause. Riding that far on a mountain bike could be a chore. Don't try to ride hard every day or you'll burn yourself out. Take some rest days when your body tells you to. Eat and drink well.