LOS ANGELES: Selena Gomez is only 23, but she’s already feeling the sting of getting older!

“You know kids don’t even know who I am anymore,” she said with a laugh while promoting her family friendly flick Hotel Transylvania 2 (HT2). “It made me so sad (because) I was literally doing an interview with this little girl … and I was like, ‘You know, when I did the show I was on,’ and she goes, ‘What show?’ I was like, what’s happening? I’m getting old!“

Gomez offered up her “sad” story when E! News asked if she’s thought about a Wizards of Waverly Place reunion.

“We literally just talked about that!” she said, adding, “I loved my show. I’m so proud of it. I miss them. I just had dinner with David Henrie. It’s just the best. I loved it. It was such a good real time in my life.”

In HT2, Gomez plays a mom to a half human, half vampire baby.

She says playing a mom for the first time was “very weird.

“But at the same time, it was cool because when I saw Dennis, my son, I immediately became like super protective already,” Gomez said. “It was so precious. I just wanted to love him.”

Shooting voice-over work for an animated film is “way more laid back,” Gomez said. “You’re there for 10 days. You’re hanging out. You’re acting crazy and making all these noises … It’s the best feeling to go in and play with people.”

HT2 will be released on Sept. 25.