Mild seepage which doesn't result in reservoir level change is normal after 100k+ miles, just keep an eye on it. Most likely the leak won't get bad enough to need topping up the fluid until it starts leaving spots on the floor.
You didn't say what year your FJ is, but the '06~'09 steering racks have a rebuild kit you can buy from the dealer which includes all of the seals and bearings for ~$150. Part number 04445-35190.
'10~ FJ racks do not have a rebuild kit, are only available new. A new OEM rack goes for $600 or so.
Here is a link to a video which shows how to rebuild a Toyota rack. I did it a few years ago on a Camry, using this video as a guide, and it was pretty easy to do: