Seems about right. For all eternity.

Never thought how boring it would be without constant invasions, megalomaniacs and friendship problems.

Luna had 1,000 years to get used to boredom.

Poor Celly needs a more exciting hobby than knitting.

Luna, just go run a post office already. As for Celestia, she could always take up buckball?

“My Mundane Life as an Ex-Princess”
 
Boy, Luna is so hyped for a simple domestic life. She probably loves having these new ‘neighbors’ and takes pleasures in a simple life. Celestia, though, feels the need of her royal duties calling to her, but she can’t just takesies-backsies on Twilight. XD

Many, many moons later, Cadence and Flurry joined them and they started a highly successful TV show called The Golden Mares, which made them bitionaires as civilians, too.

Retirement is Magic, the spinoff where we see all the mundane stuff that Cellie and Luna do after they moved to Maretle Beach, South Coltolina.

Turns out, moving into a retirement home isn’t the best idea when you’re an immortal goddess.

“Maybe we could play a board game. How does Risk sound?”  
“Not today.”  
“What about Monopony?”  
“No.”  
“Chess?”  
“Luna, I wanted a break from my old job.”

@Edhelistar  
Well, we know they live for over 1000 years without visibly aging. So from there, we can infer that they have a long lifespan.

@Background Pony #F5CA  
THIS. hugs her

@silbasa
 
@Background Pony #3C35
 
@Background Pony #B204  
We don’t know. And at this point, the now ex-show runners, will just tell us, “whatever you want”.

@Background Pony #3C35  
I’m reasonably sure that alicorns are at the very least incredibly long-lived.

@silbasa  
They can’t just die. They are immortal goddesses representing Sun and Moon

@silbasa  
If they’ve lost their immortality, this seems a better way to use their remaining years than putting up with the ponies of Canterlot.

So now they can die :S This got weird.

5 years later after retirement

Finally a merge.

Tia you need a hobby.

@Background Pony #D962  
You can’t prove they didn’t.

@ArrJaySketch  

 
She is ALWAYS cute!

Luna is so darned cute. :D

How about we head for Las Pegasus and find some gigolos?

Just go be superheros.