Just like in America different people start at different times. It really depends mostly on the parents.
3 years
In the UK, anyone under the age of 18 is classed as a child.
Legally no !... It is illegal for anyone under the age of 16 to look after another child.
yes at the age of four or upper
Though not specifically applicable to the UK, the arguments in this regard are important. See link
The Child Trust Fund issued vouchers for every child at birth. It provided a booster payment at age 7, and allowed the child to access the fund after they turned 18 years of age.
No. A person can not be adopted once they reach the age of 18 in the UK.
7 months
According to www.nspcc.org.uk/ the law does not say, it does give you a list of things to consider when leaving a child at home. for example, age, maturity level, and capability.
i am his father what age can i move abroad with my son without parental concent
No. Property can be held in trust for the minor until they reach the age of majority.
I don't know about USA, but in the UK it's from 14.