Aged to Perfection

He plays himself as a 70 something guy

FL character ages 70 years

A younger actor hired to play 70 something character

ML at very beginning.

ML's mom

ML & FL

Support character - wheelchair general

Support - Official fearing beheading

Not a strong make-up job.  1 brief scene ML in coffin & FL crying over him.

Lu Yan / Hop

ML & town leader

FL 

Support Female - mermaid - older when magical disc stolen

*very poorly executed.  Only Hair grey.  The few screenshots showing aging (skin wrinkling/sunspots/varicose veins/ eye wrinkles/ etc.) not carried through to make up on actress.

Multiple characters

Shop owner - shown briefly as old man

The Heavenly Emperor
East Sea Prime Minister

FL's mom
FL for a second in a flash forward moment

FL & Leo - make up & wigs (cringy looking - Leo's a bit better than FL)

Grandma actress made to look older

FL's dad - aged 35 years to white haired grandpa - very good make-up / looked very natural

ML in one of their scam operations.  (Top notch make-up....did not realize it was Park Hee Soon until final scenes showing each actor in their different disguises)

ML aged 61 yrs

Guest Role - Nam Sun Gyu

ML & FL2 - aged in fantasy realm
Mu Long - played her grandma
Shi Guang's master
Dragon King's assist

SuppF - Samsin Lady