definately a retired person they love it and most need to supplament thier pension we have three an standby for xmas,m/d, valentines and holidays.offer so much per delivery, if you pay by the hour some will take longer to deliver, say a percentage of your delivery charge, you will need to work out your own costs etc
start looking perhaps you have someone who comes in the shop regulary or put up a sign on your door. best of luck