There is now a new term being coined and it is "Kidult".
If you are in your 30s, young at heart and enjoys the activities that a child normally would then you are a "Kidult".
These activities include collecting and playing with matchbox cars, collecting cartoon characters like Gundam and playing war games.
I admit I am a "Kidult". Unfortunately, I have not indulge in my hobbies for over two years now.
All I can say is don't do what I did and be a proud Kidult and enjoy life.