wizards young and old

infants:

magic quill at hogwarts notes the birth of a magic child and his/her name goes on list for hogwarts.

magic is not always apperent in a child.

can be born a "squib" but this might not be known for certain for years.

can be born to muggles.

children:

even small children can use wands to create magic, but its uncontrolled.

play with toys which have limited magic, such as toy brooms that float a little above the ground.

no "elementary schools" specifically for wizard children; some attend muggle schools, others are home schooled.

a muggle family will start to realize that there is something unusual about their children if he or she is magical.

school age:

receive letter before their first year, typically the summer they are eleven, trained muggle liaison witches and wizards deliver letters to muggle families.

begin schooling with little actual magical understanding or ability.

sorted, take classes at hogwarts.

are not allowed to use magic outside school or even in the corridors between classes at hogwarts.

seven years of training.

owls and career advice in may-June of their fifth year.

more specialized classes chosen to help towards their career in sixth and seventh years.

newts in june of their seventh year.

become "of age" when they become seventeen, even if still in school.

all children who aren't squibs are sent invitations to attend hogwarts, but they don't accept all.

its possible to be expelled from hogwarts and never finish training to become "fully qualified wizards".

its also possible to quit before the full seven years are done.

adulthood:

upon leaving hogwarts, witches and wizards are considered "fully qualified".

can apply for a lesson to apparate when they turn seventeen and become "of age".

they can take up a vocation.

there is no wizard university.

old age:

wizards can live more than muggles.

e.g. dumbledore is 150 yrs. old