For transmissions in general, the metal you are seeing isn't typical. Long thin magnetic chips are a sign of a thrust washer / thrust bearing coming apart. This could be between rotating parts of in the torque converter. If the chips are not magnetic, the front pump bushing ( where the torque converter is ) is failing.

Another possibility is the rear pump / governor assembly, though I think the rear pump gears were deleted in round about your year.

Changing the fluid does little to prevent this kind of failure, it is more of a metal fatigue issue.

Typical metal is when the magnet has a bit of fur / flat areas have a slight glisten like metallic paint or a dark gray cast.

You could run it until it finally fails but it will cost you more $ if more internal parts are damaged. During a rebuild, ~ 85% of parts are reused.

Have a look at the filter, if there is any molded plastic on it there is usually a casting date.