Leaves turning yellow through out whole plant

Every plant I have ever done has had yellowing leaves at the BOTTOM.

Usually more as time goes on. They were also the first to start dying off.

This is the first time I have seen them all over from top to bottom.

Have two out of six doing this. All same watering & food at same time.

Everything else looks OK.
Not sure what’s going on.

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Yellowing of older leaves is normal. They have served their time