How does one decide whether its better to "rebuild" an existing older deck, or remove it completely and built new? Am looking at a 1960s house with a 7' x 14' deck that's off the ground about 12'- its built off the side of house and the three 4 x 4 posts sit on piers that sits on a 7' x 14' concrete pad.

The deck has never been maintained - never stained, power washed, nothing. The 4 x 4 posts are starting to twist. The rails are sagging and the deck does have some movement when ya move side-to-side. Its still adhered securely to side of the house, and I don't think it will fall down, but am wondering how much life it has left in it.

If dock has to be rebuilt, does anyone have an idea of costs to replace? Or if anything can be salvaged, "how" can you tell?