that's true..
like me i've bought a property that's about 22 yrs, but very well maintained so far..  Juz need a bit more reno only..

i would say it depends on wat's the previous usage of the land whereby the property is located ..  say, land that's palm plantation, or filled-land, etc ..  'koz that would be a 1 of very influencing factors on the life span of ur property ..
And also whether the property had been well-kept by the people staying in it ..