Milo Ventimiglia On Emotional Process of Becoming "Older Than My Own Father" For Season 2 "This Is Us" Finale

"This Is Us" fans, who else freaked out about seeing Jack Pearson (a.k.a. Milo Ventimiglia) as an old man in the season 2 finale in March?!

Now, while Mandy Moore -- who plays Milo's wife Rebecca Pearson on the hit show -- is no stranger to the 3-hour cosmetic aging process ("She’s so patient with it," Milo says), it was a brand-new experience for Milo.

RELATED: Ahead of the Season 2 Finale of "This Is Us," Milo Ventimiglia Confirms If Jack Pearson Is Still Alive

"It was crazy," the former "Gilmore Girls" star tells Rach, “to be older than my own father.”

(The 40-year-old actor had to be aged more than 30 years!)

"My mom and dad are just barely 70, and I still think of them as very young, very young-spirited," he continues, "but putting on the makeup and the hair and the little belly pad and the way the clothes were fitting and how I was standing and talking to my co-stars -- I couldn't get out of being that age in the time."

Watch Rach and Milo's chat in the video above!