For both of your plants:

Check for salt buildup in the soil. Water should run clear from the
pot, not colored.

Make sure you are not overwatering and pots are not standing in full
saucers.

Repot, if you can, with fresh potting soil. Potting soil breaks down
over the years--loses texture and nutrients and the ability to hold
air.

Fertilize occasionally with dilute houseplant fertilizer.

M. Reed