1. Yes, most folk fly fairly old aircraft. New aircraft are of course available but the price difference is huge.
2. Dependent on pilot and aircraft. A new pilot flying a non controversial common type might pay around £2.5k p.a.
3. Yes. Aerodromes are there to be flown between. Some larger airports, eg Heathrow are not available to light aircraft or are cost prohibitive.
4. Yes. There are many farm strip flyers.
5. See above.
6. Hangarage can vary between a few hundred a year up to £8k p.a. At large regional airports. I suppose maybe around £2k p.a. might be reasonable at a typical general aviation airfield.
7. I usually allow 30 minutes pre flight preparation at the airfield for a flight where I have not checked the aircraft for a while. Maybe just a few minutes following a very recent landing.