This classic wrought iron garden gate, complete with workable hinges and latches, stands 1.3m tall (plus 5cm ground clearance) and fits into a 0.9m wide gap.

Also included is a set of procedural texture nodes for generating patches of rust or grimy, mossy areas over the black painted gate. Simply alter three control values in the node groups to control the amount of rust, the amount of moss, and the amount of blistering of the paint. Or you can dig into the node groups to add your own rust and moss textures. Moss density is partially controlled by the packed, baked AO image map that works fine in Cycles or Eevee straight out the box.

The different parts of the gate are parented to the hinges and latch bracket with basic rotation constraints, so you can open and close the gate and lift the latches. There's a latch on each side, so the gate can be mounted to open in either direction. Just hide the latch you don't need, and you're away!

There appears to be a shortage of simple gates and fences on BlenderMarket. Please comment and review if you want to see more models like this. Thanks!