Решение:
- Many youngsters still live with their parents because they can't buy a house.
- When you're two years old, you're a toddler.
- Everyone in the family is very happy when a baby arrives.
- When you're a senior, you usually don't work and you often have grandchildren.
- Middle-aged people aren't young but they aren't old, either.
- When you're a teenager, it's often a difficult time. You aren't a child, but you aren't an adult either.
Ответ: youngsters; toddler; baby; senior; Middle-aged; teenager.