If you only have your SS to live on (that is what you said) then I don't see how you can afford to purchase, insure, and repair any car that is as expensive as a 2007 Boxster.
If you truly are real (and not a poser) then, I would exercise extreme caution with yout limited funds.
If funds are not limited, then your life span certainly is (that is a joke from a guy who is 61 himself).
Therefore, proceed to buy the car with all due speed.
Good luck.