Is age just a number

I have recently heard of people who want their birth notification changed from the dates appearing on them because they feel much younger. Now I don’t know about you, but imagine the contrary situation where your kid is telling they feel like they are 60 years old and you should treat them as such. That time you are 35!

I also saw people discussing whether they would date people younger than them- say 10 years younger or older- whatever the case might be.

What are your thoughts? Is age just a number?