1998 boxster mileage question
 

looking to purchase my first porsche, it's a 1998 boxster for about 13k and the mileage is at 66k, what is the life expectancy on these engines, and estimated roughly how many years would I get out of it, if I drove roughly 5-10k a year on it? Also how costly are porsche's to receive maintanence!? thanks for any advice and tips in advance.