Lactating

Sorry but biologically this is impossible. You could lactate for years as long as you are expressing it but it will eventually stop. If you knew the milking operation on a dairy farm you would get a good idea what all animals do over time. There is no such thing as an elderly milking cow. Farmers will have a milking cow produce another calf just because their milk production slowed down. It brings it back up to standards. You could continue to have children for a very long time to do the same thing. However, sometimes this doesn't work for lactation.