I have had a car that has been parked outside for 4 years. Someone told me the door seals are old; I am leaking water badly in the rain only;; no smells; onto the floorboard in front of seats and under seats. What is going on?

Check for the drain holes at the bottom of your car doors. Over the years they can get rusted and plugged up, leading rain water to seep into the car's interior rather than down the drain holes to the ground. Of course, it could also be bad gaskets etc, but check the drains first.