An Ethereal can go to the ethereal sea to Revert their age over the period of 10 years. This process reverts their age by 20, while in the ethereal sea they are considered incapasitated and do not age.

you have resistance to non-magical slashing damage

you have darkvision of 60ft.

common and one language of your choice.

as a bonus action once per long rest, you can make your form clearer making it easier for you to control your body. What it entails to have a clearer form is up to the player though no stats change. You gain the following benefits for 1 minute:

• Speed increases by 10ft.
• AC increases by 2
• Advantage on acrobatics checks

as an action once per long rest, you can make your form clear as daylight. Your shape becomes not only believable but almost true. You gain the following benefits for 1 minute:

• You take the appearance of any race you’re familiar with (what you look like in this form is up to the player) (if the race has subraces, pick a subrace as well).
• You gain one of the racial features of your chosen race.