Hi Pat, welcome to the forums.

I do not think your choice of bike should be based on age actually. More on your height, weight and personal preferences.

Whatever the case I'd recommend looking across a wider choice. The Downtube from www.downtube.com with the hub gears is a great bike. The Dahon D7 is a very good entry level bike as well. You do not need to outlay more than $400-450 for a bike that suits your needs.