a)

1. get engaged, get married, go on a honeymoon, start a family

2. leave school, find a job, get a promotion, retire with a pension

3. learn to walk, start school, apply for university, leave home

4. fill in an application, have a job offer, have an interview, start first job

5. go to nursery, start primary school, go to secondary school, attend college

6. have a gap year, apply to university, go to university, graduate with a degree

b)

0-3 years old	infant
	toddler
4-19 years old	child
	teenager
19+ years old	adult
	senior