Is it always right to tell someone to act their age ?
It does annoy me when some people see someone else who is probably enjoying themselves at an event or something and then tell them to "act their age". One example was someone criticising the singer Taylor Swift for acting like a 15 year old girl when she is over 30.
The thing is though what if someone grew up not enjoying doing things or experiencing exciting things in life when they were younger and had some struggles to overcome and now they want to make up for lost time and have a good time having new experiences ?
I seem to think in my late teens and early 20s I struggled with anxiety attacks, struggled to understand the use of money for a time etc. I went abroad for the first time in years at 25 to Amsterdam and Antwerp with family and by my late 20s, I gained confidence to go abroad again and we went to Krakow, Rome and Berlin. I even recently went to Chessington world of adventures and overcame my anxiety of going on the big rides and I went on them for the first time even though as a kid I was scared of big fast rides. I did feel the rush of adrenaline afterwards and it made me feel pleased with myself that I did it and would've liked to do it again.
Unless a person has a lot of responsibility and an image to uphold in society, then there is nothing wrong with being a bit childish once in a while, or displaying that.
Lots of people experience things later in life than other people, even those things that you describe, such as going on big rides at the theme park.