How good are your eyes should be the first question for anyone over 50 or 60. A Kadett (German spelling) can pretty much fly itself once trimmed out. Very slow, so it would not be my first choice in windy areas, but fine if you have slowed up a bunch and are literally half blind. While you may be worried about fitting the wing into your car, the fuselage and tail might be even more difficult. Another Sig design a bit smaller is their Kadet Seniorita which is about 80% of the size as the Kadet. You can't go wrong with two cycle glow with these two designs.

If you want something a bit more capable, stick with Sig with the LT-40 or LT-25. All great easy building kits that fly even better.