There is no ideal age for kids to identify their interest. Even you can realize a kid's interest when he was in 3rd. In some cases it may take more time for them to choose their path. It all depends on the kids.

For example a student has interest in music right from the beginning. But it is not in that he will take music as a profession. He may change his interest and opt for drawing. It solely depends on your kid's interest.

I can't say the parents not to interfere in their kids interests. If you find that it will not surely work or if their interests was not good then interfere in their interests and ask them to avoid it. Otherwise let them to travel on their own path.Just help them to achieve their.

Today's history makers could not have achieved success if their parents didn't allowed them to do what they are interested in. Alloy you kid to do what they like and help him/her to be a history maker of the future.

It's good to advise them about career after their 5th class. Ask them what they want to do. Help them to do that.